Those are good suggestions for reworks in the first post. Personally I would like to see the following changes
- update public playgrounds to include something that can be used by toddlers. I'm not talking about lots with a park but the surroundings next to the lots. This is the only place where you really notice toddlers were added in way to late in the game.
- update to sixam. This world needs something to do. Perhaps a bar (or make the bar from the scientist career permanent), or just food stall that appears with some drinks/items you can buy.
- add more character to the sims. I second stronger traits mentioned a few posts above mine. But I also miss the turn ons and turn offs from sims 2 and the favourite colours, foods and music from sims 3. I suppose zodiac signs also belong in this list.
- let the season holiday tradition to wear costumes include things from other packs. Especially the spooky stuff costumes, but I'm also thinking of the the knight outfit from get together, super hero outfit from city living, bear outfit's (the 'normal' ones from outdoor retreat or the coloured versions of city living or parenthood)
- and a really small suggestion to CAS. I have always trouble finding the right hair updo. Now you have to choose between short, medium and long. I think hair updo's deserve their own category.