Newsflash: Some people actually still enjoy face-to-face contact, even when PC gaming. Besides, even when playing alone, hotseat will allow you to play multiple factions and thereby test the comparative strengths and weaknesses of those factions or different units or tactics. My understanding is that hotseat is also relatively easy to implement. So why the omission? Frankly, a hotseat mode would prolong the life of this game for me far longer than anything else - except modding tools (which you implemented and did a wonderful job on).