Well since this seems to be the closest thing to a suggestion thread, I'll dump this here.
I'm hoping that sometime in the future, the gang war can be more involved. Or difficult. I mean even in an unmodded game, I get rid of my primary 'rivals' before I get a second brothel. It sort of diminishes the accomplishment when I'm just fighting random nobodies the whole time.
Maybe there could be more 'rival' bosses? Each of the brothels could be the one they own or something? Instead of just buying it, there could be a job to take it buy force, or buying out the rival's own gang to turn it over, and the rival to you? I know this won't implemented any time soon, but something to consider.
But yeah, priority should first go to girl stats. A finished system would be easier to work with. Especially now. Going back to edit the traits can be time consuming.