Sorry to be a nuisance but I have yet another question... Is there any way to alter the texture that the PTI editor uses for glass (I would edit in hammer, but again I'd like to alter some of my already published maps), I really dislike the current texture.

The texture I have in mind is /glass/glasswindow_frosted_002

I have tried editing sdk_content/maps/instances/p2editor/glass_128x128.vmf to replace all references to the old texture with the one I want to use, but when I compile the map it seems to ignore that edit and use the old texture anyway.

Thanks

using Carl's style changer, yes. I dont think there is another way

I presume then that the compiler resets the textures during the build process? If so that's a bit annoying, if only Valve gave us a way to edit maps uploaded through the PTI by uploading a BSP compiled yourself.