Someone please explain what this mouse driving a lot ppl talk about exactly is.
Apparently its even changed/tweakened a little with every new beta atm - but I cant see it and have no clue what it means.

The only thing that I notice if driving with beta client is that I notice... nothing?
I've been driving since forever using the keyboard and sometimes a joystick for tanks - please start simple and tell me how does one even do "mouse driving"?
Do I need some special key bindings for it?
What do I have to look for?