Many players play on cpma servers..i tryed some time ago but it's not for me hehe. You must know to strafe very good, to do trikjumps, to use rocketlauncher with 1000ups speed (it depends from servers)...and to have a damn good aim with rail. However it's a different style..If you want to try it download the last version 1.47 released on april 22:
http://www.promode.org/
download some maps to play CPMA from the same site...however this is the direct link:
http://challenge-tv.com/index_old.php?mode=filedetail&file=185
here is one of the many ProMode videos:
https://www.youtube.com/watch?v=sinnpYYBxgk