We could at least have a vehicle such as a large carrier plane which you could walk around in?
No, Because using No-mount does not let an avatar still stay inside the vehicle. GSF's Carrier, when someones driving it, and you no-mounted, you either just stand there and watch the ship move under you, or you stop the ship and screw it up. Im pretty sure (If an expert knows its not, then Im misleading) you can't walk on a moving vehicle without you, or it, moving.
If there was such a way, You have an idea.
It would be cool. I could drop a plane from another plane!
That makes me think of Black Marketing a Small Agency Jet from Just Cause 2.
"Helicopter dropping of another air vehicle, sweet.... Idiot"