Going that route, my focus would probably be on QoL type stuff. there are quite a few small things in that category that would be really welcome, I will have to think on a few specific things. Maybe also a few probably unrealistic things but still stuff I hadn't thought of earlier.

I'd file it under probably not doable, but I'd say one of my fantasies would be equip sets for puppets, as re-configuring them is rather time consuming. (Maybe being able to mark attachments as "favorites" so the ones you use at the most would be at the top of the list might be more realistic, that isn't a bad idea either)