When the player is inside the vehicle, and this player changes its position, for example from the driver to the gunner or from gunner to the commander, then this action takes place in a split second! Unfortunately it looks too arcade and not realistic. It is impossible to change the position for one second!
If BIS adds the interval of several seconds (for example 4-5) and add the sound of soldier movement inside current vehicle, then it will be much better and more realistic.
Most armored vehicles does not have a modeled interior, but during the switch position, BIS could add a black screen, along with the sound of movement.
Such special feature would be cool and more realistic.
BIS, Please try make this feature