>BUT... I did note that (now?) the Time Warp button does NOT retain focus after a selection is made. Could the same thing be done with the top "More:" drop-down too? And, if yes, can it then also be left at the last selection?

The only think we do is to reset it to Go back. Otherwise, if you choose Last 2 minutes, how would you able to fire it again? That has been discussed before. It is quite ok to put it back on top after a selection.