CAS tools you'd like to see?

Definitely second the more walk options mentioned, and the layered clothing, I do understand why this would be a big workload to add though. I'd rather non-layered clothes than flat ones.
Piercings are cool, I have them in real life, so It would be cool to give them to my Sims but not something I care either way for.

Like somebody else said definitely more CAS relations..

I want a new belly (pooch) slider. I love the natural lower belly curve most if not all women have, and the way the slider has been crafted in TS4 makes the entire belly look more swollen/bloated if anything. So that annoys me a bit, as it's something I give all of my Sims.

I'd also love more facial details. The few we have are basic.