Newer versions of Hammer, like starting with either Left 4 Dead or Left 4 Dead 2, I think, have native support for previewing blend textures right in the 3D preview window. I'm curious why this is, and whether it would be possible to hack this in by just copypasting one of the newer Hammers into the TF2 folder.
Also are there any other differences that are hard coded into the tool instead of the FGD files?
Also are there any other differences that are hard coded into the tool instead of the FGD files?