User requesting to be in a usergroup

[Hollister]

ok my forums promotes team competitions, we have 4 teams. These 4 teams are currently user ranks, this is because each team has a logo and therefore i want to use user ranks so the logo is dispalyed in there post bit.

The person userrank is based on the usergroup i put them in

The problem is each time someone wants to join a team or change teams i have to change their usergroup manually.

Is it possible for a member to automatically select there own usegroup or userank?

Or if not send a request to be added to a certain usergroup,that will autmomaticallt add them if an admin agrees.