Typically, if I'm using a push stick, I use the work rest to support the work and the push stick to pin-point pressure for grinding. I just use a piece of scrap micarta that I've rounded off. I prefer a slick push stick to something sticky, as I typically am moving my work and need the push stick to change position on it smoothly. I know makers who use UHMW plastic for that reason.
The only time I use a push stick without the work rest is when I'm tapering a tang, as I need the control my hands give me.
If your belt is "grabbing" your work and pulling it down causing you to suddenly thrust your knuckles into the belt (been there, done that), you may what to try a different belt brand (Norton's Trizacts/Gators work well for me whereas I found Klingspors to be very grabby), try less pressure, or try wiping the blade dry after each dunk in the water bucket. A wet belt will typically grab more than a dry one, especially if it's just wet in spots.
--nathan