This is all very time consuming and yes, I DO have doubts it's worth the hassle to be honest. But I'm almost halfway through so quitting now would be stupid.
Doing a separate scenario for the RCW would be even more work, so that's right out. It's a hobby project after all.
For solo games players can choose whether to include the RCW at the start of the game, the checkbox replaces the tutorial checkbox since Potzblitz players don't need a tutorial anymore.

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In multiplayer, after Russian surrender, the CP (Reds) player will have to signal that he is willing to prolong the game. The Entente (Whites) player will have to respond to signal his consent.
Red Army and White Guards will then keep on fighting even if all other nations of their alliance have surrendered before.
Should the Whites win then Russia will not count as having surrendered for the final victory outcome.
Should the Reds win or the Entente player declines to play on then Entente will lose 1 "victory star" (see management panel).
In both single and multiplayer it will be mandatory that the October Revolution has happened, so if Russia surrenders without the Red Revolt, before or after, then no chance for an extended game, even if the checkbox was ticked at the start of game in singleplayer.