Idea for a femal role in a Deathwatch Kill-team: Serve tea. Alternately: Go Blizzard and let her run around in skimpy armour, giggling and bouncing her goodies every 5 mins.
The debate on whether there can be female Marines, what female characters would fit in, if you can include a female Inquisitor, yidi-yidi-yada is so boring. Yes, the concept is so misogynic that it hurts, from the outset. Do what the hell you want with it. Toss GW canon out the window and make your kill-team all female. And if you don't want to tweak the published material, play something else. Reduced sales will hurt FFG and they'll think twice before publishing something marketed at males (i e the majority of the tabletop roleplaying community) ever again.