Yeah, the ambient background level of RP in DUST is pretty high. Which makes what I'm about to say next a real shame:
At the moment, DUST is incompatible with focused roleplay corporations. The reason for this is simple: focused roleplayers, e.g., just about everybody who frequents this forum, are rare, and it's difficult to get us all moving in one IC direction. DUST's best features are solidly team and corp-oriented: you need voice comms and enough players to reliably be able to form squads during most active time periods, or people will wander off to join entities offering better odds of success. This is particularly crucial if you plan to get involved in planetary conquest.
There just are not enough roleplayers in DUST playing like-minded characters for us to establish a strong DUST corp of our own.
I've signed up with a flat-out merc corporation, the Pink Fluffy Bounty Hunterz ("PFBHz" - I'm not sure whether the fact that they're one of DUST's deadliest corporations makes the name more or less funny), and plan to remain until I see a viable, RP-oriented alternative. This is not to say I'm giving up: quite the opposite. I'll just be developing Tarquin-as-ruthless-pragmatist rather than Tarquin-as-wounded-man-of-principle for the moment.
... And I might just see whether I can start up an immersionist "club" within PFBHz.