Promotions - How to change the display group?

[Yorixz]

I've been reorganizing my forum's usergroup a bit in order to make it somewhat more semantical/logical, I've found one problem so far though;

When I use the promotions system to promote my users after x posts towards an extra (additional!) usergroup, 'group2', there is no way to configure what usergroup should be used as display group.

The reason I'm trying to find a way to change this is that I'm using a secondary usergroup that only has a couple of different permissions, but should receive another username color/title/group showing up in posts.

Can anyone tell me if this is possible in any way or point me in the right direction (in case of a modification) how I could change this to suit my wishes?

Thanks in advance!