So exciting to it finally happens! No hotkeys is the only reason to stop me doing more provinces...
My humble suggestion to the hotkeys. Instead of using B/T/M to choose troops from the 3 producers, it may be better to use 'Tab' to switch from left to right. Most people (including me lol) uses right hand to click mouse so most of time they use only left hand to click hot-keys. So, ‘M’ is bit far away for left hand... 'Tab' key is born to switch between tabs... so it may be easier to get people used to.
Moreover, I know it may be harder to realize, but if we can save the troop selection somewhere and can load it directly to battle, it can save huge of effort. LOL