Yes, they do but mostly the radical Inquisitors go for Xeno-working on casual basis I.E. have them in their retinue. So yes there could be mercenary Xenos, or ones with ties to the Inquisitor(Alliance, pact etc.) in the Inquisitor RP.
This is what I'm hoping for. Not that all the DH classes are lame, but I'm curious what Urien Urian Uri*n will allow.
Anyone is welcome, although I hope to get a bit higher standard of RP done, kinda like current Deathwatch or Infinite Stars.