Dont suppose anyone knows the furthest distance(in units) a player can jump on an unmodded server? I'm trying to eliminate the possibility of people jumping up broken walls onto rooftops. It may be a long shot but it would save me alot of jumping about if someone knew the answer

Probably with grid 8 selected make it 12 units apart? I'm not entirely sure to be honest, but the best way aside from knowing or from testing it yourself would be simply to put a caulk texture around the roof. Many official maps have incorporated this technique I believe. Once again, you may want to wait for a better response as there may be an even better way around this problem.

Im not really sure how far you can jump, but in vCoD you could jump probably 250-300 units with strafe jumping and good FPS. CoD2 seems to have lowered the didstance that players can jump. Im assuming maybe 64 units at most?

To block the jumping you could add a clip, or as metioned above a caulk brush.

thanks, i dunno why i hadnt thought of that ;)