Movement commands work on Windows but not Mac or Linux. Tested on different OSes.

Windows client
/+accelerate_______________________valid (see note 1)
/+accelerate 1000__________________valid (1)
/accel____________________________valid (1)
/+decelerate______________________valid (1)
/+strafeup_________________________valid (1)
/+strafedown______________________valid (1)
/+strafeleft________________________valid (1)
/+straferight_______________________valid (1)
/strafeud__________________________valid (1)
/strafelr___________________________valid (1)
/+rotatecw________________________valid (1)
/+rotateccw________________________valid (1)
/roll______________________________valid (1)
/+brakes__________________________valid (1)
/throttle____________________________valid
/alias mycommand "+accelerate 1000"___valid (1)
bind above command with button________valid (1)

Mac client
/+accelerate_______________________nothing
/+accelerate 1000___________________nothing
/accel_____________________________nothing
/+decelerate_______________________nothing
/+strafeup_________________________nothing
/+strafedown______________________nothing
/+strafeleft________________________nothing
/+straferight_______________________nothing
/strafeud__________________________nothing
/strafelr___________________________nothing
/+rotatecw________________________nothing
/+rotateccw________________________nothing
/roll_______________________________nothing
/+brakes___________________________nothing
/throttle____________________________valid
/alias mycommand "+accelerate 1000"___creates alias & does not work
bind above command with button________nothing

Linux client
/+accelerate_______________________nothing
/+accelerate 1000___________________nothing
/accel_____________________________nothing
/+decelerate_______________________nothing
/+strafeup_________________________nothing
/+strafedown_______________________nothing
/+strafeleft_________________________nothing
/+straferight_______________________nothing
/strafeud__________________________nothing
/strafelr___________________________nothing
/+rotatecw________________________nothing
/+rotateccw________________________nothing
/roll______________________________nothing
/+brakes__________________________nothing
/throttle___________________________valid
/alias mycommand "+accelerate 1000"__creates alias & does not work
bind above command with button_______nothing

### NOTES ###
(1) "/+Accelerate" (case exact) does not work but all other cases do work.
Ditto: Accel, +Decelerate, +StrafeUp, +StrafeDown, +StrafeLeft, +StrafeRight, StrafeUD, StrafeLR, +RotateCW, +RotateCCW, Roll, +Brakes (all case exact) commands