Joinable groups with approval

[jluerken]

Hi,

I created a free to join usergroup where every user can join or leave like he/she wants.

Now I want to have a small addition to this.

I created a forum which only customers can see and I added some Moderators to the forum (NOT to the Moderators group which is a difference).

I now want the following:

I want be able to create a public group where the user must ask to join.
The group gives the user access to several or one special forum.
The moderator of this forum must approve or reject the joining request.

This would be a great addition to vBulletin cause currently all this must be done by an Administrator and I don't want to allow simple mods to enter the users menu in the AdminCP cause then they can change and see a lot of more things.

Kind regards
jluerken