Most motion commands do not function at all on OSX. Simple button-press commands, such as +Accelerate, function. However, +Accelerate 0 does nothing. The Accel command likewise does nothing.

After some testing, I found these commands and their granular variants behave the same. You can bind the basic +Command and and it will work, but the 0-variant and granular variant are simply ignored.

+Commands
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+TurnLeft, +TurnRight, +TurnUp, +TurnDown
+StrafeLeft, +StrafeRight, +StrafeUp, +StrafeDown
+RotateCW
+RotateCCW
+Accelerate

Granular commands
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Turn
Pitch
Roll
Accel
StrafeLR
StrafeUD

My system
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Apple MacBook Pro (13-inch, 2011)
OSX Lion 10.7.5

I will reply with any other information you need to fix this issue.

I heard this was by design to prevent plugins from directly controlling your ship.

Would a dev please comment on this?