I just started playing Nexuiz a few months ago, so I don't have experience with anything except 2.4.2. I was watching this video of what I presume to be an older version:
http://www.youtube.com/watch?v=ZRiCKNye9_s
It looks like there used to be a pitch/roll effect when the character strafes. That seems to be gone in the current version. Any reason? I think it really adds realism to the movement.