It will be great if we have spectator mode for AI vs AI competition on dual maps.
For now i use maps for 3+ players, and use already memorized combination: Shift+BackSpace, Select my units Alt+K (we are defeat - yeah-yeah, ok), Ctrl+O - place the command center for maps, Ctrl+O - choose the desired bot to watch him.
All this set will be easy to use in 1 click for spectators, and of course the spectators should not occupy a player slot.
Is it difficult to implement?