"The one Multitexturing Shader to rule them all!"

BTW - I was wondering if its possible to retrieve the texture by using trace on multitexturing shaders? This would be very usefull in racing games in which you want the player to slow down depending on the texture there on. As far as I can read the scan_texture command will only detect a terrain as a whole. I'm not completely sure though, so if anyone knows of a method to do this please share it. Thanks.