Great news regarding special textures! I've got shaders running on the DC version. However unlike in the PC version shaders are being saved in one single file(QUAKE3\BASEQ3\SYSTEM\SYSTEM.ZIP\shaders.txt)
and seem to lack support for some commands from the PC version.
Here are some shaders in action:
-Single texture animations(moving, wobbling)
-multiple texture animations(pseudo reflection)
Also I've got over two dozens of new maps running on DC. They still need some manual tweaking because of their custom shaders, but with the new knowledge, it's a matter of time until they are running perfectly fine.