Unfortunately your USB motion controller does not support the M10 / M11 commands so they will not work.
You could replace your controller with one that supports these commands - you would also need to fit new stepper drivers etc.
A reasonable solution may be to modify your Post Processor to replace the M10/M11 commands with say B0/B1 then configure the B axis within Mach3 and then use the B axis Direction pin for laser switching. (an axis movement command will, like M10/M11, operate without breaking the constant velocity chain - so no delay like M3/M4).
Tweakie.