When playing with more than two heroes, I'd like to be able to switch to a specific hero rather than cycling between all three (especially since sometimes the game will cycle between two heroes and ignore the third one (all of them alive)).

Not quite sure how to implement that, since holding the corresponding button is already used for the command menu (perhaps more items in that menu could work).

Pretty sure you can press 1, 2, or 3 to choose the heroes respectively

I don't have any 1, 2, or 3 button on my controller. I also did not specify that I was using a controller, so fair enough ;)