XF 1.1 Possible to make Secondary_groups work as group_id?


I'm wondering if it's possible to make Secondary_group_ids work as group_id. I have fiddled around in the code tried changing some variables but XenForo is gigantic and I have no idea where to start looking.

The reason why I want to do this is because I have no use for the multiple groups and I am probably no going to ever use it, though I do have use for a Secondary_group (not groups).