If I had my way, I'd convert my group over entirely to Black Crusade and play the Chaos-side of space swashbuckling. Considering the playstyle of some of my players, it might not be that big of a change.
Black Crusade has the same rules regarding actions and talent interactions as Only War, but has an even more open advancement set up that would be great for the 'big-movers' of a voidship (or pirate wolfpack) that may drasitically change midgame (harder to do with aptitudes). I also like Infamy way more than Profit Factor and Fate points, especially as it's a moe fluid resource. The BC minion rules need some work, but they would be great for building up 'secondary officers/assistants' for the various roles.
I may be odd in this, but I've come to dislike the origin path and would prefer the Passions (Pride/Failing/Motivation), but I tend to unhitch the hard-set mechanical modifiers (look at the BC House Rules thread to see more) to allow more variety.