Like what issues? I can't work with "had issues". Please be specific, and toss a dev a log when something is wrong so I can (try to) fix it.
You can map a custom action to Home long press in CandyShop>Navigation>Hardware keys settings... always could, as long as we've had the CandyShop going and the device overlay.
I'm interested to hear what/why you feel it's not the smoothest? I have yet to find a single hang up or even a stutter in this rom in my daily use.
I understand. I'm asking what you are having issues with. "For you"