WordPress MU

In the plugin I'm writing, I'd like to execute a function after a user's role on a blog is changed from 'Requestor' (created for this plugin) to any other role on the blog. I have been unable to find any hook that will let me add my action at the appropriate time.

Am I overlooking something? How 'close' can I get to the change of user role to add my function? Would query or update_user_query help?

I've gone in and added a hook, around line 145 of wp-admin/user.php, in the 'promote' case of the switch($action) statement. This allows actions to be added just before the user's role is updated. The user id, old role and new role as passed as parameters.

That should work. Feel free to submit this patch if you want to the trac:

http://trac.mu.wordpress.org