Redmine

It would be very nice if the group list were sorted alphabetically everywhere (I've found the groups tab in an edit user view not to honor that), and I think users and groups should at least be kept separate (i.e. user1, user2, user3, group1, group2 instead of user1, group1, user2, user3, group2) in places they appear together (e.g. the members tab in a project's settings).