Serious Sam Classics: Revolution

Serious Sam Classics: Revolution

How do I turn on viewroll for Revolution?
Hey, just curios on how I can turn on viewroll back in this title.

If you don't know what I am talking about, allow me to explain. Back in the classics (not this one) there's a little feature that rolls the screen when you strafe to the left or right. It's like in quake if you're confused; your camera rolls when you strafe in there also.

Please, if somebody knows how to turn this thing on, that would be very appreciated!