Wrote a small greasemonkey script to move around new comments faster with ctrl+up and ctrl+down. It's similar to a script posted by simonov http://www.esreality.com/?a=post&id=2225035 , but without animations.
Tested on firefox with greasemonkey.

Readme:
https://github.com/melbaa/esr_scroll

Install:
https://github.com/melbaa/esr_scroll/raw/master/mel.user.js

Code:
https://github.com/melbaa/esr_scroll/blob/master/mel.user.js