Well...here is my idea...I saw it on a server one time and I loved it...so i thought i would add it to mine...but i have never found it.
In CS you jump in units...i believe, Is there a way that when someone types /longjump it would turn on a unit measurer and display to the user where text is...Longjump stats have been turned on. So if you dont have the stats on it wont record anything. while stats are on every jump you make will say a HUD message that just shows:
You jumped: 234.222 or whatever number
and records this to a simple top15.
So then if you place anywhere in the top 15 it would say to everyone in text area:
NAME just placed 1st or 2nd or 5th up to 15th with a jump of NUMBER !
I guess another thing to check for would be if the ground they jump from is almost equal to the ground they land on...so someone cant jump off a building and land somewhere far away and glitch the Long jump program.