Gun
S default munition
A second munition
W third munition
D fourth munition
M3 reload
3 look left (Smooth tracking keeps things on target when turning fast or with a damaged gun)
R look right (Same as above, the arrow key defaults are too far away to be useful)
L-Shift to dismount
Helm
W for descend
S for ascend
Wheel for throttle
1 second piloting tool
2 fourth piloting tool
4 third piloting tool (I prefer to play gunner, and this compromise is actually more ergonomic)
Space to return piloting tool to neutral. (Easy to use in a panic response if I forget to turn stuff off)
L-Shift to dismount