@GirafHuntr We just installed MCCC this afternoon, and so far, it's doing the things we want it to do. It might be just what we need for relationship management.
Z and I created a "laboratory" version of our save, in which we're trying things out. We think we managed to use the Import Tray Sim Percent function to make it so the University dorms were filled with Sims from our gallery. We thought it might only use Young Adults we had saved, but it took Clara Bjergsen, whom Z had once given some wardrobe changes, turned her into a YA, and sent her off to Foxbury!
Z squealed when she saw Clara and began creating her backstory. "This is her before she met Bjorn," she concluded. Watcher Z gave her a maiden name and gave her back her Foodie trait, because the game had given her a new, randomized set of traits. Clara was joined at school by an Elder we created, who retained his appearance even though he was a Young Adult. Again, CAS was employed to age Thomas down to a Child, and then back up to a Young Adult version of his dapper, older self.
@mightysprite I would be just fine if my Sims developed friendships like you described. In fact, I hope they do make friends if I've rotated away from them. It's the romances I'd rather control. And if membership in Partihaus can't make a Sim get his flirt on, what will? ;)