I was thinking how to have the script always running conveniently.
Monitoring it i found no obvious cpu usage, thats nice.

As a patch it would be started after boot but patches are ment to alter existing files, not to start up scripts, right?

They way i am doing currently is okish, only after boot i need to manually hit the Kbdlight starter and the script runs until killed.

But how to do this correct, is my noob question

The script runs without superuser privs, as regular nemo user.