Are you able to swap between seats with the radial wheel?

Not at the moment.

You can enter the remote turret from the driver's seat, but the multi-crew aspect...

Yeah, but that's what that is. That's switching the seats of the vehicle. There's two different seats for the driver.

Not for 3.20. In the future, we might do. Because, obviously, the tank has three seats, actually. It's got your remote machine gun and... well, the turret.

We did look into making it so that you could have multiple people in the tank. The thing that came up was basically that the second person only got to use the piddly laser gun, so it wasn't really worth them being in it.