My team in particular is a rogue trader void master navigator and tech priest. we're currently playing in the koronus expanse. It seems like everything in the game relies on the rogue trader , as he has all of the fellowship skills, setting up missions, asking for favors, commanding crew and the like. Now the GM has gave the tech priest a few things dealing with the adeptus mechanicus to go off of, but how can you really get a navigator and voidmaster into the scenes? It seems like their only function is navigating the warp and piloting the ship , no real roleplay opportunities if you know what i mean. Any ideas on how to get them involved?

As the RT's delegates they share his authority, so other PCs can take whatever opportunities you decide to throw at them. What's the Void Master's background? If s/he's ex-Navy or ex-pirate, use them as contacts, even allowing the player easy access to the appropriate Peer talents to make their Fel more useable. In the same way, the Navigator has an authority all their own, and can wield the stick in the right circumstances, such as discovering archeotech Warp Compass components or the like, they'll have the responsibility to their Guild to consider (i.e. make sure the thing's destoyed).

There is a few more options for ship position in Into the Strom

having the RT do RT stuff while the other players are doing the real job in the back ground. RT as to do a diversion during diner so is acolite may infiltrate the mansion and find where the shield is located.

The RT as to keep rolling high Fellowship scores, etc to keep the diner party interested and diverted.

The RT also as to relly on the speed of is freind because they will make the link if the players are discovers...

etc.

Having a fight on the bridge, while sailling full throtle in an asteroid field and the shields keep bucling down. This will mean every roll from every member of the crew is critical. ) Piloting , navigation, WS, BS, tech use, scrutiny) it's up to you to create situations where the RT as to be overloaded, you are in a sword fight with a NOb, you don't have to time to order all those poeple around... etc.