In my opinion, you need to have full control of the throttle,
Not for a Bendix. Throttle is either OFF until ~15%N1, then it is snapped to IDLE. You could take it to full open if you wanted to, but ensure it is back at IDLE before N1 gets to 58%.
If the start is going hot, thumb is over the detent release, so it pushes it in, hand rolls throttle fully OFF. No control needed, just a snap left to open, a snap right to shut off.
I know that my right hand would take years to develop the muscle memory to operate the 2-finger technique, my natural sense is to lift the index finger off if my middle finger goes down. That would be really sad.
The Oz Army was pushed into this technique by a particular CO who is now associated with civil school, where it is also enforced. Except for grumpy old mongrels like me who still thumbed the buttons.