Here are some sample to use keyboard emulation with Battlefield2 from EA-games, I think it works also in Battlefield3, please test it.
This command have english and german phrases.
To use this commands use VC0.933 and above and you must activate the VC DXinput plugin from James!
Have fun
Kalle
play with delay in DXinput settings (18ms is good for me) when it not work correct