If the game partially recognizes your controller, you might get double inputs. Use a tool like HidHide to "hide" the controller from the system so only Xpadder's keyboard emulation is seen by the game.
While Modern Warfare 3 is legendary for its Spec Ops mode and cinematic campaign, the PC port’s controller support can be finicky. Xpadder allows for: Xpadder Profile For Call Of Duty- Modern Warfare 3 SKIDROW
The biggest challenge with Xpadder is making the mouse look "smooth." Set your in-game MW3 mouse sensitivity to . If the game partially recognizes your controller, you
Want to play "Tactical" or "Lefty"? You can map any button to any action. Xpadder Profile For Call Of Duty- Modern Warfare 3 SKIDROW
Master Your Controller: The Ultimate Xpadder Profile Guide for Call of Duty: Modern Warfare 3 (SKIDROW)