If "tap-hold" is the universal start to gestures, that would be pretty easy to remember. If a line is going to be drawn when gestures are made, could it be a lighter shade of gray or a dotted line or something, just to add that visual difference from regular scribble mode? I know you can scribble in lighter shades, so I don't know if that would be enough of a visual difference, hence the dotted line suggestion. I don't scribble in lighter shades myself, though.
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