No one has brought this up yet that I've seen so I thought I would.
I think it should get some attention because I can remember the posts and attention it got on the CoH forums.
The ability to have single player bases/groups and be able to invite your alts to a group/base that only has characters belonging to a single player.
If this is at all possible I think it would be something that would be greatly appreciated by those players that did this back then and either had to have 2 accounts or invite temporary members to get their alts invited.
I have no idea if it's possible.