personally I find that the drawing tool is awesome, and would be disappointed if it could be disabled. an option, as GM, to clear all of ONE PLAYERS drawings would be nice though, I tend to use a LOT of little marks throughout a fight, indicating all sorts of things. (lines for spell durations, squares and circles for spell locations, and to represent when characters have done shit to mess up my maps (tipping over tables, busting down doors, and generally leaving messes behind)