@sock: You want to test this quick hack up of Q2 map compatibility? No extra command line needed, it will just ignore the extra fields and texture paths
It works a treat, thank you. :) I wanted to test the -forcegoodtree parameter and it does indeed make the marksurfaces lower.
Original - 39768 marksurfaces 79536
New - 40166 marksurfaces 80332
New + fgt - 37811 marksurfaces 75622
Here is the full compiler stats.