Add a key to break the scrolling

[Acedyn]

Sometimes, I spam my scroll key to scroll faster. I would be very cool i we could just press a key to instantly stop the scrolling where my cursor is. That way i can set my scroll settings pretty low to be precise and i can just spam 3/4 time the scroll key to scroll faster and just hit a break key to stop de scrolling where i want

[dlee]

I think it should also immediately stop if while the scrolling is happening you attempt to scroll the opposite direction.

[dlee]

Is this a duplicate of #27?