BuddyPress: Let Only Certain Roles Create Groups
Restricts creating BuddyPress groups to the roles you choose, such as editors or paying members, while everyone can still join groups.
Snippet Library
Users snippets for WordPress
Snippets for user accounts, roles and profiles: extra profile fields, new columns in the users list, last-login tracking and tighter control of what each role can do. Handy for membership sites, client sites and teams with many authors.