I would love is if CAS got an update/overhaul which would include adding career and skill levels (as well as skill locking setting). I'd even like to add milestones, and reward traits at least for YA/A/E (so they have an established background). I hate I have to go into live mode, cheat, add, then save the household again for later (but forget what they have and have to place them in live mode to check again), etc.
I think we should be able to have editing extended family trees in world management, and edit/manage world without having to create a household first. I am big on setting up a game/save file first (often having to re-do and re-make master save files as templates).