I have had this thought for a while so here goes.
A while back I played a bit of Warmachine/Hordes and in that there was this idea of themed lists. These lists had fairly strict requirements for what models and upgrades could be included. If you met the themed requirements then there was a certain "benefit" applied to your list.
Is this something that would add to the game?
As an example - One I would love to try - Vader's Bounty Hunters
List must include - Boba, Bossk, 4LOM, Zuckuss, Dengar and IG88 as either pilots or crew.