Blitz
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In my opinion, the "Wait" function isn't that necessary. During the opponent's turn, you can take your time and carefully consider your next move. On large maps, you might change your mind several times about how to make a particular move. There are other things in the game that need improvement more than this.
The need for this function doesn't really arise until about 2 weeks into the game, when you've scouted the map and need to start thinking about what to take and how to arrange your troops.