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Regarding the issue of encouraging players to share their save files:
1 Perhaps it would be worthwhile to create and maintain a thread where players (from both sides) can post daily comments along with their save files, focusing on specific noteworthy games. This could spark heated discussions and generate ideas like, "Well, I would have developed in this way, for example... Although, who knows... maybe the offline monsters will have their say?" Presumably, with a well-implemented approach, players will simply find it interesting to share their save files, knowing that they will be discussed. Again, this could bridge the gap between the online and offline versions – like lectures and seminars.
2 A "spur-of-the-moment" idea: in interesting key games, try to implement a "feature" – make an online reporter the third player. For example, simply lock him in the map editor, and no one touches him (don't shoot the reporter; he's writing as best he can), and he comments on the game's progress. As the opponent progresses, players, if possible, share their impressions. I tried a rudimentary version of this in the game Mizrael-Dubrovin. :) By integrating all of this with player reports after the game, IMHO, we could obtain interesting and informative material.
P.S. These are just ideas; please don't judge them too harshly and, if possible, try to constructively address the obvious difficulties, which I didn't even bother to describe to avoid rambling...
P.P.S. By the way, during the discussion of this, Izgoy rightly pointed out that it would be good for players to describe the battles themselves – the only problem is how to implement it so that there is also a visual representation for the audience – for now.