@kanga are you sure you're in the right thread? :D @guitarguy00 no problem. I'm curious myself now. I heard back from @coven . He's one of the head Max devs. He said Maya keymap still has issues and I'm waiting to hear back on the selection modifier keys being exposed in general.
I also have a button assigned to backspace/delete :D You're on the right track though - assign to those macro the hard to reach or uncomfortable buttons for a more ergonomic working experience! Also: if you can, consider assigning there some modifier keys, like Ctrl/Shift/alt (I press alt with my right ring finger), so…