creates and applies an MFT_DeferredTranslucencyEmpty shader feature to fill out the col2.g channel when no translucency map is in use (otherwise it'd create an uncompileable shader) also handles masked specular maps vs specified slider-driven values in a more robust manner (equivalehnt of https://github.com/Azaezel/Torque3D/commit/d9da994ed2b14ddc233175d4c39c1e67a8e46033 )