A force nation would be kinda cool for the Dom3000 mod.. I agree, have it balanced with both jedi and sith, combination magic/holy spells as per ulmish smiths, probably using astral and death respectively. Storm troopers with blaster, wookies for melee, x-wins/tie-fighters for ships and your force users as commanders. What's not to like?
bring in movie characters as heroes, pretenders as per this mod and its all there.
I guess the main issue would be how to separate the way it plays from Space Ulm. Probably in the commander emphasis, they should be designed to be very capable thugs, probably by having the force spells as powerful self-buffs. Also awe/fear/life drain/soul vortex could be very thematic starting abilities for the more powerful units