It's func_friction, but I don't think you can change it for the player unlike a trigger_gravity...
I have a problem with it. I can't find it! It's nothing between func_dustmotes and func_guntarget! That is troublesome because they are put up in letter order!
Oh and if I manage to fix it, do you go through it? Should I cover my entire map with it or should I mark all of the ground and change it?
edit: Spelling. Oh, the grammar!
you only put that in the part you want in the map , like for instance a big jump , put the trigger there and fill the space .