Keybind

Hoping someone can help. I am in the closing stages of adding slingloading to a chinook pack. Everything is done (memory point, slingload code in the .cpp etc..) however for some reason the key command to lower the hook (2 x R) does not work. I have checked my controls are set correctly to 2xR and have tried switching it to something else, which does not work either. You CAN access the option from the scroll-wheel menu and ropes lower and hook up fine to the cargo. I'd really like to have the keys work though. Do I have to add something into the .cpp to ensure this? If so, what?

Thanks.