2D mode:
W - Move image up
S - Move image down
A - Move image left
D - Move image right
Q - Resize canvas to canvas size + 32
E - Resize canvas to canvas size - 32
G - Resize canvas to image size
H - Resize canvas to window size
J - Resize canvas to 2x window size
K - Resize canvas to 2x canvas size
L - Resize canvas to /2 canvas size
X - Resize adequately to mouse position
I - Toggle equirectangular mode
C - Rotate counter-clockwise
V - Rotate clockwise

3D mode:
Q - Zoom camera in
E - Zoom camera out
W - Roll object up
S - Roll object down
A - Rotate object left
D - Rotate object right
R - Move object up
F - Move object down
SPACE - Reset position
Z - Open texture editor
T - Toggle wireframe mode
U - Update textures
INSERT - Insert texture