Add different campaign and order ability (xeno, hereticus, malleus)....

....And Deathwatch squads ----->space marine

Totally agree, the best thing about Neocore having made a game about the inquisition is that "Inquisitors have the right to call on the services of any citizen or servant of the Emperor." you have the option without offending the loremasters of putting ANY servant of the emperor in this game, personally i would love to see an Ogryn, that would be stupidly cool being able to play as something so big and the potential weapons he could use. Also maybe Catachan jungle fighters, Cadian shock troopers,  i definitely like someone else's suggestion on this thread of a member of the Adeptus Mechanicus, either a tech priest or a Skitarii. So many games have come out where it's either JUST Space Marines or the biggest focus is on Space Marines, being able to play as some of the other types of characters in the vast imperium would be fantastic.

I think we could settle on having available both genders for all classes (an independent battle sister would be pretty much a female crusader), and further down the line consider adding new classes.

As for space marines, i think the crusader scratches that itch (big armor, big guns) without having a giant super-man breezing through the game.

Personally I would like adeptus mechanicus characters, using crazy implants as most of the equipment.
I think to recall there was a lesser Ordo of the inquisition (Ordo Machinum I think?) that usually deals with tech-heresy and xenos tech; it wouldn't be a bad fit for this game's story.