Additional subscriber roles in og

Hi all,

I'm setting up a couple of groups on my Drupal 5.1 site, and would like to achieve the following :

Groups 1 -
These groups are of brands. Let's say I have groups named "BMW", "VW", "Porsche" etc, instead of showing the subscribed users as "subscribers", I would like them to show up as "fan of BMW" or "owner of VW" or "ex-owner of Porsche". They all have the same permission level (can leave comments, not post stuff). Only the admins can edit and post stuff to these groups.

Groups 2 -
These groups are of different racing teams. There are 2 different kinds of subscribers (with different permissions) within the same group. So within the group "BMW Racing Team", "fans" can leave comments (like everyone else) and "team members" can post stuff to the group.

Additionally, on a user's profile page, it shows that this user is "a fan of BMW", "an owner of VW" and "a team member of the BMW Racing Team" etc, with clickable links to the respective groups.

Is this possible? If so, could anyone share a tutorial or some code snippets to achieve this?

Thanks in advance ! :)

Shirley