No, since the mod tools haven't been created yet you'll have to wait a while before you can do things like these. Treyarch's primary focus right now isn't to get mod tools to us, but rather to make sure that the game is running smoothly and how they'd like to see it running.
"Life is tough. It's tougher if you're stupid."
yeh I noticed that its impossible to mod any of the maps - for example, I zlib decompressed nuked and changed some of the worldspawn settings like set the sunlight to low and direction as well but no matter what I do, the map is still exactly the same. I think its to do with the encryption because most of the file is still encrypted and all that you can get out of it is the *.map files.
I heard that someone extracted these *.map files and managed to load them up (with parts missing) in WaW Radiant - however, because the encryption is different, even if you mod it in Radiant, they won't be usable in black ops.