Here is why I asked...
from what I remember, and I've done plenty of this; Making Doom mods was a snap, crap I'd do them just because I was bored and had nothing better to do, took me from 2-6 hours to make a MOD, I worked on total conversion packeges for doom which didn't take more then 3 months, from concept to working game, and this is all people doing that on their spare time.
So, don't get me wrong here, but I don't see what's the big deal of changing a couple of textures, cerating a character and making different objects, that's the kind of stuff I used to do in a matter of hours..
Were the tools lost or something? There were tons of tools available to unpack WAD files, to re-crompres them, and endless turorials which were very well documented; I probably still have the MOD's and tools I used on my server somewhere...
And that's why I asked if somehow, on the JAG, these files were encrypted/locked or just different somehow which makes creating mods so hard...