I just finished a game where there were max units on each territory, and 100s of units to place, with return to attack & fortify. It got very tiresome, having to click back and forth between the map and the selection bar, and although the hot keys helped, they seemed incomplete.
Ideally, I think you should be able to play wargear and never have to move your mouse up from the board area.
Here are my suggestions for some more hotkeys:
Placing phase:
return -> apply
Attacking phase:
right arrow -> return to place
left arrow -> move to fortify
Fortifying phase:
left arrow -> return to attack
return -> end turn
Maybe something else would be better than left/right arrow since they are on the other side of the keyboard from a,t,and most of the numbers.