I agree and disagree. As a general rule, you shouldn't be screwing with the scrolling behavior, but in case like this (with a slider-type of interaction), it is

I agree and disagree. As a general rule, you shouldn't be screwing with the scrolling behavior, but in case like this (with a slider-type of interaction), it is a bit more understandable. What I can't stand is when people do it just to affect the acceleration/whatever of scrolling as a gimmick. This has some usefulness at least and doesn't affect my experience negatively at all.