No its not :p
Only limited things are server side info,
e.g. smoke granades, i increased the amount of smoke, but only effected my machine no one elses,
All things like weapons power worked
Increase the Hit rate to 5000 on a a bullet ( not the gun) increase them all all the bullets to 5000
then repack and go ingame and shoot a buliding watch the biuilding fall to the ground,
It does work and on Mutiplayer, i did it for about 5 days and got bored as i over powered all the weapons,
But keep trying and done give up,
If all failes when i get a chance tomorrow maby ill post up a copy of my Weapons .pbo and you can conpair them and see whats what.
Dave