diff --git a/release/project_release.module b/release/project_release.module
index c5bfcaa..f11e30d 100644
--- a/release/project_release.module
+++ b/release/project_release.module
@@ -40,8 +40,8 @@ function project_release_menu() {
     'title' => 'Releases',
     'page callback' => 'project_release_project_edit_releases',
     'page arguments' => array(1),
-    'access callback' => 'project_user_access',
-    'access arguments' => array(1, 'administer releases'),
+    'access callback' => 'project_release_project_settings_form_access',
+    'access arguments' => array(1),
     'type' => MENU_LOCAL_TASK,
     'file' => 'includes/project_edit_releases.inc',
   );
@@ -90,6 +90,18 @@ function project_release_menu_alter(&$callbacks) {
 }
 
 /**
+ * Access callback for node/%project_node/edit/releases subtab.
+ */
+function project_release_project_settings_form_access($node) {
+  if (variable_get('project_release_sandbox_disable_releases', FALSE) && $node->project['sandbox']) {
+    return FALSE;
+  }
+  else {
+    return project_user_access($node, 'administer releases');
+  }
+}
+
+/**
  * @defgroup project_release_node Drupal node-type related hooks
  */
 
@@ -801,6 +813,12 @@ function project_release_form_alter(&$form, &$form_state, $form_id) {
   if ($form_id == 'project_release_node_form') {
     return project_release_alter_release_form($form, $form_state);
   }
+  if ($form_id == 'project_settings_form') {
+    return project_release_project_settings_form($form, $form_state);
+  }
+  if ($form_id == 'project_promote_project_form') {
+    return project_release_project_promote_form($form, $form_state);
+  }
 }
 
 /**
@@ -880,6 +898,42 @@ function project_release_alter_release_form(&$form, &$form_state) {
   $form['buttons']['submit']['#submit'][] = 'project_release_node_submit';
 }
 
+/**
+ * Alters the project settings form.
+ */
+function project_release_project_settings_form(&$form, &$form_state) {
+  $form['sandbox']['project_release_sandbox_disable_releases'] = array(
+    '#title' => t('Disable releases for sandboxed projects'),
+    '#type' => 'checkbox',
+    '#default_value' => variable_get('project_release_sandbox_disable_releases', FALSE),
+    '#description' => t('If checked, projects marked as sandboxes will not be able to have releases associated with them.'),
+  );
+}
+
+/**
+ * Alters the form for promoting a project from sandbox to a full project.
+ */
+function project_release_project_promote_form(&$form, &$form_state) {
+  if (variable_get('project_release_sandbox_disable_releases', FALSE)) {
+    $node = node_load($form['pid']['#value']);
+    $form['releases'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Enable releases'),
+      '#return_value' => 1,
+      '#weight' => 10,
+      '#default_value' => $node->project_release['releases'],
+      '#description' => t('Allow releases of this project with specific versions.'),
+    );
+    $form['#submit'][] = 'project_release_project_promote_form_submit';
+  }
+}
+
+/**
+ * Submit handler for project promote form.
+ */
+function project_release_project_promote_form_submit($form, &$form_state) {
+  db_query("UPDATE {project_release_projects} SET releases = %d WHERE nid = %d", $form_state['values']['releases'], $form_state['values']['pid']);
+}
 
 /**
  * @defgroup project_release_nodeapi Node API hooks
@@ -944,7 +998,12 @@ function project_release_project_nodeapi_load(&$node) {
  * Insert release information about a project node.
  */
 function project_release_project_nodeapi_insert(&$node) {
-  db_query("INSERT INTO {project_release_projects} (nid, releases, version_format) VALUES (%d, %d, '%s')", $node->nid, 1, '');
+  if (variable_get('project_release_sandbox_disable_releases', FALSE) && $node->project['sandbox']) {
+    db_query("INSERT INTO {project_release_projects} (nid, releases, version_format) VALUES (%d, %d, '%s')", $node->nid, 0, '');
+  }
+  else {
+    db_query("INSERT INTO {project_release_projects} (nid, releases, version_format) VALUES (%d, %d, '%s')", $node->nid, 1, '');
+  }
 }
 
 /**