Rather than change the player camera height, you can lower the offset of the HUD model using the gunspec text file in the respective weapon folder. It's hacky stuff at present, but there are plenty of values in there for you to play with!
PC SPECS: Windows 7 Ultimate 64-bit, Intel Core i7 920 (PASSMARK:5008), NVIDIA Geforce 9600 GT GPU (PASSMARK:752) , 6GB RAM
