Shattered Ascension v4.0
Thought I'd give you a heads-up here at the official boards about the latest (and perhaps last) version of SA, an alternative rule-set to SE. You might find things here to make your games more action-packed, tweaks to introduce new strategical choices/depth, maps and political variants that enforce player negotation, as well as rules for 2-player games and other stuff. For advanced players, it's worth checking out. It took 6 years to develop this, and the balance in this system is absolutely stress-tested.
Thread is found here (1000+ replies may sound overwhelming but it's a lot of good discussion found there for enthusiasts of the game to persue)