In the CAS department I wish beauty spots could appear anywhere on the body, preferably also passed down as a genetic thing. Say each parent with a spot would raise the chance with 50% for a child having a spot, randomly positioned.
Also would like a way to tag a CAS item to a specific sim, to make sure nobody else uses it. Would use this for heirloom, like jewelry, but also for special outfits.
In household details, I'd like to see plates/bowls/mugs with different colors. It's kinda boring that all have white. We can recolor each sim's cell phone, so why not also having a default color/pattern per household when it comes to dining ware?
I always found the relation panel confusing. Most times I open it is to check the sim's best friends, but they are never sorted by friendship strength, I assume they sort by how long it's been since their relation was changed. Because sims often meet without the simmer's control/intention, I never found this sorting handy.
