So here's how my config. for combat arms, its sort of like CoD4:
A Button= Jump
B Button= Crouch
X Button= Reload/Action
Y Button= Toggle Primary/Secondary weapons
L Bumper= Radio Situation
R Bumper= Fire mode
Back Button= Scoreboard/Map
Start= Esc
Left Stick Click= Sprint
Right Stick Click= Mission Equipment (Don't know what that is...)
L D-Pad= Toggle Melee weapons
R D-Pad= Toggle Support weapons
U D-Pad= Radio Reply
D D-Pad= Radio Request
L Trigger= Sights
R Trigger= Fire weapon