different "shortcuts"
Here's a big list:
Q = Pencil Tool
W = Straight Line Tool
E = Eraser Tool
R = Zoom Tool
T = Hand/Move Tool (Whatever you want to call it...)
Y = Play
U = Pause
Backspace = Delete Last Drawn Line
WITH A LINE TOOL SELECTED:
1 = Blue Line
2 = Acceleration Line
3 = Scenery/Green Line
WHILE PLAYING:
Z = Zoom in
X = Zoom out
M = Slow Motion
Might be forgetting a few.

I was wondering different shortcuts you can use. I know about zooming in and out with z and x, and using shift to change the direction of the line, but are there any others?
NO I DIDN"T