There was other stuff there, I'll wager. He didn't just up and quit Chex Quest for no reason.
Maybe we could fix the bug, and y'all know Xbolt knows DEHACKED...It would take some work, but it would be doable.
Personally I have no desire to go to GZDoom. I like the retro appearance of ZDoom. The pixelated graphics and obnoxious rotating sprites are part of the charm of Doom and its derivatives. I think when you start putting features like hardware-accelerated rendering, 3D model support, 24-bit textures and such to Doom, you are adding all the features of modern engines but suffer from having to use archiac tools and sector-based level design. I think at that point you should just upgrade to something else. I think a Chex-themed modern FPS could be pulled off if you found an acceptable toon shader. Sort of how Team Fortress 2 looks, but taken even further.