It sounds useful (especially for someone like you who hand inks all the time).
That may work... except you don't look in the mirror while you're at the store. You need a message that says something like "Hey you random person reading my forehead, remind me to buy white ink". XD
Yeah maybe... I don't know, it just always looked nicer to me somehow... maybe because I know it's harder because I know digital inkers have a 'back' button. Or maybe it is the tactile thing like you said. ^^