Now that I read the thread again and saw where you said you were struggling
Basically use mouse button control to change the side keys(which are mouse button 4/5) to some random key you don't use while playing coh2,like print screen.
(Google how to disable print screen so you don't lag when u press it)
Then download autohotkey, use a text editor like notepad,paste the code I left in the other thread into it,, save it as coh2.ahk on your desktop, double click it before you start the game
Ez.