On This page, you can find a very comprehensive list of ZQuest Hotkeys, courtesy of KJAZZ.
However, a number of things must be updated and added.
1) Every time it says "B = Show number of active layer," it should be changed to "B = Refresh all transparency values."
2) Ctrl+ Left / Right in the tile editor saves the current tile, and moves one in that direction. (May also work up and down, but I'm not sure.)
And I have one question. What exactly is "P = Press to open the display picture window."?