Shortcut Keys
Is there a shortcut to move the camera to the flag--in editing mode--after you've placed it while riding? Zooming out and searching around can get rather tedious, and I'm nearly positive this shortcut exists (Note: it most certainly is not Ctrl + I).
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To play the track at the current zoom level is easy!! All you have to do is zoom in or out to the zoom level you want to play the track in. Then hold down shift WHILE you play the track. Hope this helps! 
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Any track I give 10/10 gets an LRE Trophy!! They are not real, they just give the track maker a chance to be happy about the track!! LRE Trophies so far: Retro Sub & Owly's The New Old School!! 
Heres a couple more I dont think have been mentioned.
Shift+D+ clicking the start point will reset it
HOME = go to start
END = go to end
F = go to flag
BACKSPACE = delete your last line
SHIFT + zoom = reset zoom level
A + hitting start = start from beginning even if there is a flag
and my favorite (fun to mess around with)
Hold control + hit start to draw lines while it is playing
hope that helps
I'm familiar with these shortcuts:
Y = Play
U = Stop
Q = Pencil
W = Pen
Space (hold) = Hand momentarily for quick movement
Shift (hold) + Press Play = Keep zoom from 'edit' mode
Z = Zoom out
X = Zoom in
M = Slow motion on/off
Shift (hold) + Draw Acceleration line backwards = Backward acceleration
But, what other ones are there?
Like the one for playing the track with the line colors showing (if there is one) and any other random shortcuts.
I'm sure more people than just me would be grateful for any contributions to this thread.