CPU/CPU sliders won't come out until at least REDitor. 2K13 is a mess in CPU/CPU still due to the play calling and offensive tempo following missed baskets, so I've given up on that part of the game until we either get a major patch or the ability to do mass edits to the roster again. I usually spend more time on CPU/CPU than on the sticks so it hurts to not have a true CPU/CPU slider set for the community this year.
The sliders are compatible with Quick Play, but the Game/Player Speed is the biggest problem you'll face using these in QP. I'd recommend tweaking Game Speed down to around 55-60 in Quick Play to get a similar game speed.