This would be nice! I had to Friend an FC member just so he could mail me a Recruit-A-Friend code. I don't mind having him on my friends list, but it just would've been easier to skip that step. I'd also like to be able to mail materials to our crafters without having to take that extra step of Friending them first, or just having to drop what I'm doing and teleport to the clubhouse and Trade there instead.
Also, speaking of our homes, I'd like to have the option to let some people, but not everyone, have access to my apartment. It'd be great to have the option of allowing just Friends and FC members to drop by and hang out!