X Delusion posted this update at http://homebrew.dcemulation.org :

With the arival of nxDOOM Beta 2 RC1, comes better compatability with MODs, thus the page will be getting some intesting updates over the next few days! Also I have posted Black Aura’s new Chex Quest Deh file on the page, which will make the game play more like the original than ever before. You can keep up to date with nxDOOM at:
http://files.frashii.com/~sp00nz/Doom/

Thanks to X Delusion for the news.