Fine granular administration permissions
I think it would be a good idea to have more granular admin permissions. What I mean by that is only an admin, as far as I can tell, can create repository groups and user groups. I would like to be able to give some developers the ability to create repo and user groups without full admin privilages. If you really wanted to take it to next level it could be extended into the repository groups permissions, as in a user is allowed to create repo groups, but only in other repo groups and not globally.