At certain times when armor support is crucial to victory,
sometimes there's this douchebag whoring the tank for the whole match,
trying to snipe people with the 120mm cannon, and killing no one.

How do you deal with these kind of players?

Things I've tried and didn't work:
Smoke grenades to annoy the driver
- does not guarantee that the tank driver will move
- waste of my time

Using land mines to make the tank fly to the front
- couldn't get the tank flying (I know, I suck)
- Tank don't exactly stay in 1 spot (more like moving forwards and backwards, for some weird reason)

Requesting the tank driver to move
- As if he listens... >.>

How is that gonna make the tank driver move?

Drag them up
Beat them up
then throw them off the building.