My own wishes for an eventual DU refresh would be the following :
- Add the careers that are missing diplomas (really, that seems like just an oversight)
- Let children ride bikes (and learn to ride them)
- Add more clubs for teenagers, like debate club, school newspaper and soccer team, so they can work on that and get scholarships
- Make some classes active, where you will do activities specific to what you are studying.
- Make some career levels locked unless you have a diploma (I wouldn't make it the whole career, as some people would forget why it's not showing up in choices).
- Make the Commons lots more alive somehow, so that sims who hang out there will do things (yeah, I should probably make clubs for that since it's an AI issue and unlikely to change unless they manage to do something about it with basegame, but it's worse on the Commons lots in my game)
- Maybe add a graduation party social event (for both uni and highschool, perhaps?)