It would be nice if there was an option at Romance Relationship 5 to keep her in the Group and keep going on Dating / "other" events with her at the cost of triggering a scandal.
or maybe just the ability to still interact with her after marriage ...
I just finished a Romance Rout and the Idol was very well written, so I am a bit sad that all options at 5 would stop me from having further Romantic Interactions with her, I kind of wish I could keep interacting with her after she became my wife :v
I think more Formation for Idol groups would also be nice,
Trio Formations, Duo Formations, Quartets, and 5-Star Groups ...
The Pyramid is nice and all, but I think it could be fun to have more and smaller options!
Maybe as DLC?