I implemented "random walk" which I have much use for. Maybe that is what you call jitter above.
You can always try my particle system implementation if you feel like playing. Maybe it will give you some ideas.
Documentation on how to use the particle system: http://www.dualheights.se/demorize/reference/ch15s01s09.shtml
I'm also interested in trying new physics ideas so if you have any, please share and I can try implementing them in my system.