Yes. I've tried what Zaz said a few months ago - to raise the zone's Z axis to be above an interior that spawns peds (for example, The Four Dragon's) which didn't do anything. Having the entire San Andreas zone be highlighted green doesn't work either.
And by getting homies to spawn in interiors, I mean like how they do in say, Grove Street. You know, how you see them in groups smoking in drinking? Yeah, that, but in interiors. I don't think that's possible to do!
Anyone want to prove me wrong? I'd love to be proven wrong honesty, as I've tried to get this to work for a while now.