The best would of course be, if this would be added into JJ2+. I know thats not gonna happen (soon), because Blur has other things on his head and things like JJ2+ are a pain to code

Then there is the other solution, making a client-side app that everybody needs to run. This will be a hassle to check, and a lot of people really aren't waiting for a Punkbuster-like spyware next to their jj2...

So, I've decided to do what many have already tried:

I'm remaking JJ2, cross-platform, compatible with 'normal JJ2'. This will take a lot of time, and i encourage you to find another solution in the meantime. However, it'll become open-source once I've made some progress, so adding a fix/something against cheats will become a piece of cake in comparision with JJ2, from which the sourcecode is not in our hands.

This post was done in a rush, so sorry for any errors/typo's.

I'll leave you with this while I'll go and have lunch.
http://lun4rsoft.info/wiki/doku.php?id=project_fukkatsu