No , it is impossible to hit q and tab with the pinky while maintaining good position over the rest of the keys next to and below it..
If you move your pinky just high enough to hit q, your ring finger and middle finger will overshoot "w " and "e"
This is highly-undesirable, because "e" is so commonly used, you really want this to be as convenient a transition as possible.
When the middle finger overshoots "e " if you don't intend to move ur whole hand back (this counts as a hand lift, btw).. then the finger must be curled way way back to hit "s" and "d"
So to make the " q " happen on pinky without any whole hand motion, You're overshooting "w " "e" ontop of having a lengthy and difficult transition to "s and "d"
SO you see.. it is absolutely invaluable to use ring-q AND ring-tab.
jacobolus--- your understanding of ergonomics typing techniques is near 0.. please do not make conjectures that lead people down paths that could not only cause RSI, but also perform at suboptimal transition fluidity.
I am not claiming that equivalent performance Can't be achieved using pinky-q or pinky-tab..
My point is , those are less efficient choices..
This applies to the Hover technique as well, because even if you hover, yes the transition time cost is negligible because your hand is already LIFTED..
However, you still have to make up and down motion vertically to make pinky-q..
This adds unnecessary jitter, which increases overshooting nonetheless..
So by hovering, transition time is reduced.. but the Jitter is still there.. lowering reliability and precision