Backlash compensation would like like M425 X0.02 Y0.02 Z0.02 at the top of the gcode file, or in the lightburn header gcode section to be automatically added, as long as your backlash meets factory spec. If you’re measuring more than about 0.05 I’d recommend tightening the rails as this leads to long running positional error (more on that here):
You don’t need the DSP license.
For laser inline power currently it’s only working OK with the 10W laser and it isn’t publicly available yet, you’d have to compile from source from github so there will still be jitter, but I think it won’t matter much for what you’re doing at the moment.
To test backlash I’d do something like this: A350 - Not printing perfect circles - #25 by brent113. Generate a file with circles, before each circle int eh gcode file insert a new backlash. Here I did .1, .15, .2, and .25mm.
For any more you should probably start a new topic and reference this as this isn’t really anymore about the 10W laser, this is now talking about machine calibration.