Add site by platform

this belongs to hosting.

Nice, this is something I've wondered about... why didn't we have this before ...

Some remarks:

+++ b/modules/hosting/site/hosting_site.form.inc
@@ -125,10 +125,16 @@ function hosting_site_available_options($node) {
     $allowed_plats = _hosting_get_allowed_platforms($user->uid);
+    if (!is_null($platform)) {
+      $allowed_plats = array($platform => $platform);

The first call to _hosting_get_allowed_platforms() is only needed if (is_null($platform)). '$allowed_plats = array($platform => $platform);' could be in the else.

+++ b/modules/hosting/site/hosting_site.module
@@ -58,6 +58,15 @@ function hosting_site_menu() {
 
+  $items['node/%node/add'] = array(
+    'title' => 'Add site',
+    'type' => MENU_LOCAL_TASK,
+    'page callback' => 'hosting_site_add_by_platform',
+    'page arguments' => array(1),
+    'access callback' => 'hosting_site_add_by_platform_access',
+    'access arguments' => array(1),
+  );

This path seems a bit to generic to my liking....

hosting_site.module uses node/%node/site/add

Ideally this would follow the same pattern, but that would probably be too much effort for this feature.
What about 'node/%node/platform-add-site'?

agreed.

Darn... merge conflict

Merged, thanks