I'm currently running Final Sanction, and I'm planning to run Oblivion's Edge afterwards. I plan to allow the players so spend some of the earned XP. I own Rogue Trader, but do not know it very well, not having a chance to play before. My plan is to allow them to spend their XP according to the tables in the RT corebook. Perhaps Arch-Militant for the Tactical Marines, Sensechal for the Apocathery. There will need to be tweaks to ensure everything works right, but I think it's worth a shot.
Thoughts?