I think there's not enough bandwidth for such information density. These usually work with 2D directional commands, you're driving the cursor up/down/left/right

I think there's not enough bandwidth for such information density. These usually work with 2D directional commands, you're driving the cursor up/down/left/right. You're not thinking of "letter E", but look at the screen and think of the direction where the cursor has to move from its current location to drift to E.