Your next best bet after Liberation would be to use LoaderX. I'm not sure if it is up to date with 1.2.208, but it's the only other one besides Liberation you can use (though I would recommend just sticking with Lib for mod loading).
1. Use liberation on patch 1.2.208 and not 1.2.211
2. Try to see what "5" is supposed to be bound to, maybe you rebound it to something else, hence why it won't work.
3. If you keep cheating in MW2 (any patch), your VAC day counter will not reset.
I moved Mossy V8 into my Lib folder. Now, do I /have/ to downgrade my iw4mp.exe or can I play it with the new one? Also, can someone send me the buttons to show where it allows me to do all these hacks?