Someone mentioned RMF support....I could help with that if you're interested Muzz.
Well, when version 1.0.4 is released, the Export to MAP option in Hammer will be obsolete. Why? Because i've incorporated HLFIX into the Compilator. When you want to compile a map, you simply open the rmf file and when you click the compile button, HLFIX reads the rmf file, generates and .map file which is then processed by CSG, BSP, VIS and RAD.
So, using the Export to MAP feature in Hammer is not longer required, because HLFIX will generate the .map file for you. The .map file generated by HLFIX is much more sophisticated than the .map file generated by Hammer.
Quote from the official HLFIX site
:hlfix is a tool that converts Worldcraft/VHE format files (.rmf) to standard .map files. In the process, it performs a number of geometric operations to fix common problems with brush geometry. hlfix is far more sophisticated than VHE's built-in map export feature. The purpose of this tool is to give map designers much greater flexibility in the type of geometry they use to build their maps.
Im not sure if this is what you were thining of, Peng.