Its really good but when i try to play opposing force it does not work sadly but i think this is very good :)
Viewing post in Xash: half-life - browser port comments
Well, there is another problem, after typing in the command you said, the guard that is supposed to be alive and fighting a zombie scientist, is already dead, meaning that the event that allows you to advance to the next map is canceled, so you have to enable cheats and then enable noclip, because without it, you just get softlocked again.
(Same thing with the trapped walker in the toxic pool areas)