Once again, I am pulled out of hiding in my nice dark corner.
There's nothing wrong with ChaosEdit, you can add an almost unlimited amount of walls/textures to it. The same goes for sprites/objects. The problem lies within the Wolf3d code itself. You can only add a few more (I think like 7 or 8, maybe more I forget)before you have to change the code itself. Also, all new added walls/textures that are not doors, must be put before the door frame, otherwise things get screwy.
It's been a while since I messed with all this and my answer may be partially flawed. But, if you know how to code or want to get into it, it can be done...
Hope this helps with your madness....
Ok, I just read your link and it was a question I HAD. Hehehe. Wow. Seems like so long ago.
Here's what Nex said: "Add the wall textures (horizontal/vertical) right before the first door texture. Modify the lists.txt and that's it. I think the new wall set is number 52 or so. Adding walls works fine until you hit number 64. Then you need code changes or the game displays the wrong texture."
You need to look in the directory of ChaosEdit, click on mapobjects, then click on Wolfenstein 3D folder (I assume you are using wolf3d original files), then open up the lists.txt file and there you can add the name and number of your new wall/texture in. Remember, the new wall tiles need to be put in ChaosEdit BEFORE the first door pick, or things get messy.