Like a gunner can switch types of ammo and smoke launchers, it would be nice for the driver to be able to switch to binoculars. While using the binoculars he cannot drive (or at least not steer) until he switches back to his 1st 'weapon', the driving tool.
Currently when I park a Bradley or something on a hill on a map like Kohat Toi, overlooking the valley, I get outside of my vehicle so I can look with the binoculars to help spot the enemy for my gunner. Even though many armoured vehicles only have a small hole to look through, the option to zoom in from inside the vehicle would be nice.
Having the binoculars as a different tool puts the vehicle in a weaker position as the driver will still have to switch back to the driving tool if he wants to drive off again. About 3 seconds to switch to and from binoculars, as if he is putting it away before driving again.