Players puzzle constructor: Players can build puzzles and submit it to the subterfuge with the winning condition, where it will be ranked by other players, and will be ranked by difficulty by attempts to solve puzzle. And offline mode for puzzles.

Blitz game: game, where default speed of subs between outpost is 2 minute, and neptunium cap for winning the game is lowered (or faster mining), for the fast games 2-4 hours long.

I definitely like the community puzzle creator!

I don't know about Blitz mode so much, because it becomes a game of tactics rather than strategy, alliances would be harder to solidify, and because of this new fast-paced nature people would tire out pretty fast (2-4 hours of high intensity activity is a bit too much for most).