diff --git a/code-server/main.tf b/code-server/main.tf
index 30b92bc..8c0f1e0 100644
--- a/code-server/main.tf
+++ b/code-server/main.tf
@@ -95,6 +95,12 @@ variable "use_cached" {
   default     = false
 }
 
+variable "extensions_dir" {
+  type        = string
+  description = "Override the directory to store extensions in."
+  default     = ""
+}
+
 resource "coder_script" "code-server" {
   agent_id     = var.agent_id
   display_name = "code-server"
@@ -110,6 +116,7 @@ resource "coder_script" "code-server" {
     SETTINGS : replace(jsonencode(var.settings), "\"", "\\\""),
     OFFLINE : var.offline,
     USE_CACHED : var.use_cached,
+    EXTENSIONS_DIR : var.extensions_dir,
   })
   run_on_start = true
 
diff --git a/code-server/run.sh b/code-server/run.sh
index 2444324..b04e131 100755
--- a/code-server/run.sh
+++ b/code-server/run.sh
@@ -6,10 +6,16 @@ CODE='\033[36;40;1m'
 RESET='\033[0m'
 CODE_SERVER="${INSTALL_PREFIX}/bin/code-server"
 
+# Set extension directory
+EXTENSION_ARG=""
+if [ -n "${EXTENSIONS_DIR}" ]; then
+  EXTENSION_ARG="--extensions-dir=${EXTENSIONS_DIR}"
+fi
+
 function run_code_server() {
   echo "👷 Running code-server in the background..."
   echo "Check logs at ${LOG_PATH}!"
-  $CODE_SERVER --auth none --port "${PORT}" --app-name "${APP_NAME}" > "${LOG_PATH}" 2>&1 &
+  $CODE_SERVER "$EXTENSION_ARG" --auth none --port "${PORT}" --app-name "${APP_NAME}" > "${LOG_PATH}" 2>&1 &
 }
 
 # Check if the settings file exists...
@@ -57,7 +63,7 @@ for extension in "$${EXTENSIONLIST[@]}"; do
     continue
   fi
   printf "🧩 Installing extension $${CODE}$extension$${RESET}...\n"
-  output=$($CODE_SERVER --install-extension "$extension")
+  output=$($CODE_SERVER "$EXTENSION_ARG" --install-extension "$extension")
   if [ $? -ne 0 ]; then
     echo "Failed to install extension: $extension: $output"
     exit 1
diff --git a/dotfiles/README.md b/dotfiles/README.md
index eb64563..2939025 100644
--- a/dotfiles/README.md
+++ b/dotfiles/README.md
@@ -18,3 +18,16 @@ module "dotfiles" {
   agent_id = coder_agent.example.id
 }
 ```
+
+## Setting a default dotfiles repository
+
+You can set a default dotfiles repository for all users by setting the `default_dotfiles_repo` variable:
+
+```tf
+module "dotfiles" {
+  source                = "registry.coder.com/modules/dotfiles/coder"
+  version               = "1.0.12"
+  agent_id              = coder_agent.example.id
+  default_dotfiles_repo = "https://github.com/coder/dotfiles"
+}
+```
diff --git a/dotfiles/main.test.ts b/dotfiles/main.test.ts
index a075a27..6026719 100644
--- a/dotfiles/main.test.ts
+++ b/dotfiles/main.test.ts
@@ -19,6 +19,15 @@ describe("dotfiles", async () => {
     expect(state.outputs.dotfiles_uri.value).toBe("");
   });
 
+  it("set a default dotfiles_uri", async () => {
+    const default_dotfiles_uri = "foo";
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      default_dotfiles_uri,
+    });
+    expect(state.outputs.dotfiles_uri.value).toBe(default_dotfiles_uri);
+  });
+
   it("set custom order for coder_parameter", async () => {
     const order = 99;
     const state = await runTerraformApply(import.meta.dir, {
diff --git a/dotfiles/main.tf b/dotfiles/main.tf
index 3e19fb9..cf21864 100644
--- a/dotfiles/main.tf
+++ b/dotfiles/main.tf
@@ -14,6 +14,12 @@ variable "agent_id" {
   description = "The ID of a Coder agent."
 }
 
+variable "default_dotfiles_uri" {
+  type        = string
+  description = "The default dotfiles URI if the workspace user does not provide one."
+  default     = ""
+}
+
 variable "coder_parameter_order" {
   type        = number
   description = "The order determines the position of a template parameter in the UI/CLI presentation. The lowest order is shown first and parameters with equal order are sorted by name (ascending order)."
@@ -24,8 +30,8 @@ data "coder_parameter" "dotfiles_uri" {
   type         = "string"
   name         = "dotfiles_uri"
   display_name = "Dotfiles URL (optional)"
-  default      = ""
   order        = var.coder_parameter_order
+  default      = var.default_dotfiles_uri
   description  = "Enter a URL for a [dotfiles repository](https://dotfiles.github.io) to personalize your workspace"
   mutable      = true
   icon         = "/icon/dotfiles.svg"
@@ -47,4 +53,9 @@ resource "coder_script" "personalize" {
 output "dotfiles_uri" {
   description = "Dotfiles URI"
   value       = data.coder_parameter.dotfiles_uri.value
+}
+
+output "dotfiles_default_uri" {
+  description = "Dotfiles Default URI"
+  value       = var.default_dotfiles_uri
 }
\ No newline at end of file
diff --git a/git-config/main.test.ts b/git-config/main.test.ts
new file mode 100644
index 0000000..1241956
--- /dev/null
+++ b/git-config/main.test.ts
@@ -0,0 +1,69 @@
+import { describe, expect, it } from "bun:test";
+import {
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+} from "../test";
+
+describe("git-config", async () => {
+  await runTerraformInit(import.meta.dir);
+
+  testRequiredVariables(import.meta.dir, {
+    agent_id: "foo",
+  });
+
+  it("can run apply allow_username_change and allow_email_change disabled", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      allow_username_change: "false",
+      allow_email_change: "false",
+    });
+
+    const resources = state.resources;
+    expect(resources).toHaveLength(3);
+    expect(resources).toMatchObject([
+      { type: "coder_workspace", name: "me" },
+      { type: "coder_env", name: "git_author_name" },
+      { type: "coder_env", name: "git_commmiter_name" },
+    ]);
+  });
+
+  it("can run apply allow_email_change enabled", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      allow_email_change: "true",
+    });
+
+    const resources = state.resources;
+    expect(resources).toHaveLength(5);
+    expect(resources).toMatchObject([
+      { type: "coder_parameter", name: "user_email" },
+      { type: "coder_parameter", name: "username" },
+      { type: "coder_workspace", name: "me" },
+      { type: "coder_env", name: "git_author_name" },
+      { type: "coder_env", name: "git_commmiter_name" },
+    ]);
+  });
+
+  it("can run apply allow_email_change enabled", async () => {
+    const state = await runTerraformApply(
+      import.meta.dir,
+      {
+        agent_id: "foo",
+        allow_username_change: "false",
+        allow_email_change: "false",
+      },
+      { CODER_WORKSPACE_OWNER_EMAIL: "foo@emai.com" },
+    );
+
+    const resources = state.resources;
+    expect(resources).toHaveLength(5);
+    expect(resources).toMatchObject([
+      { type: "coder_workspace", name: "me" },
+      { type: "coder_env", name: "git_author_email" },
+      { type: "coder_env", name: "git_author_name" },
+      { type: "coder_env", name: "git_commmiter_email" },
+      { type: "coder_env", name: "git_commmiter_name" },
+    ]);
+  });
+});
diff --git a/git-config/main.tf b/git-config/main.tf
index 050df61..2b9544a 100644
--- a/git-config/main.tf
+++ b/git-config/main.tf
@@ -78,10 +78,12 @@ resource "coder_env" "git_author_email" {
   agent_id = var.agent_id
   name     = "GIT_AUTHOR_EMAIL"
   value    = coalesce(try(data.coder_parameter.user_email[0].value, ""), data.coder_workspace.me.owner_email)
+  count    = data.coder_workspace.me.owner_email != "" ? 1 : 0
 }
 
 resource "coder_env" "git_commmiter_email" {
   agent_id = var.agent_id
   name     = "GIT_COMMITTER_EMAIL"
   value    = coalesce(try(data.coder_parameter.user_email[0].value, ""), data.coder_workspace.me.owner_email)
+  count    = data.coder_workspace.me.owner_email != "" ? 1 : 0
 }
diff --git a/test.ts b/test.ts
index 37e0805..97416cf 100644
--- a/test.ts
+++ b/test.ts
@@ -171,9 +171,9 @@ export const testRequiredVariables = (
 export const runTerraformApply = async (
   dir: string,
   vars: Record<string, string>,
+  env: Record<string, string> = {},
 ): Promise<TerraformState> => {
   const stateFile = `${dir}/${crypto.randomUUID()}.tfstate`;
-  const env = {};
   Object.keys(vars).forEach((key) => (env[`TF_VAR_${key}`] = vars[key]));
   const proc = spawn(
     [