Naum sei se realmente funciona, poe ainda naum peguei o 1.4
Retirado do SoGamed.com
"Since 1.5 the F1 and F2 keys doesnt work anymore due to bind reservations. But there is a way to fix this. Try to rename the files "demoeditor.dll" and "gameui.dll" in the "...\valve\cl_dlls" folder to any other filename. Then the keys should work again"