One of the issues i've encountered running DH (not so much RT) is the lack of the "non-combat" character. While there are classes, Adept and Tech Priest, Though Cleric and Scum can also fill this role, that fill it, i find it hard to get characters interested in them, or even thinking they are important.
My current game is a BioPsyker, an Assassin, a Arbitrator, a Guardsman, and a Tech Priest (playing mostly medical/heavy support role). Between them they have enough skills to get through most things, but they are lacking in lores an such to help them find out their opponents weaknesses, relaying mostly upon firepower and the handful of interaction skills the Arbitrator has been forced to pick up becuase no one else will.
Has anyone else encountered this? And, if so, what have you done to work around it? I would love to throw some non-combat sessions at my players, but they are so convinced that the Dark Millienium is all Purge and no Convert that its impossible, and making me less and less interested in running the game.