All controls can be reconfigured, other than moving the mouse to move the camera:
W or Up Arrow: Move Forward
A or Left Arrow: Move Left
S or Down Arrow: Move Back
D or Right Arrow: Move Right
Spacebar: Jump/Jetpack
Left Click: Fire
Right Click: Alt Fire
1: Weapon 1
2: Weapon 2
Mouse Wheel: Change Weapons
R: Reload/Special
Q or Mouse Button 5: Ultimate (Qtility)
E or Mouse Button 4: Melee
Left Shift: Thrust Down (Fall Faster). Hold to activate Sliding (maintains momentum, but hard to turn)
F: Class Specific Bomb (F-Bomb)
T: Chat
G: Team Chat
C: Switch to Class Select
Tab: Switch to Team
O: Switch to Settings