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Re #20:
For a user with hand tremors, it's still easy: move pointer over object, let go of mouse. Alternatively, pressing down slightly on a mouse usually causes enough friction to hold it still. With a trackball, take fingers off trackball, etc.
I use a Razer Copperhead set to maximum sensitivity. The slightest movement causes the pointer to whizz off screen, but I can hold it still easily. In a situation where I need to hold the pointer still for a long time, letting go of the mouse works well.
But anyway, to cause the tooltip to appear, the user already needs to hold the mouse still, so what's the difference? To cause it to continue to display, the user just does more of the same, or lets go.