[n2vwz]

Is it acceptable to drop the "autostart.sh" file into the "LIBREELEC/Configfiles Share" folder from a networked windows machine?

Should work, yes.

The autostart.sh patch doesn't seem to be working.

I just updated to #0810
I then screen scraped intel-fullrange.sh from your link, pasted it into a text file using notepad, renamed it to autostart.sh and then dropped it into the Config Share folder.
After rebooting, I toggled the limited range setting. The background went from too bright to brighter. I left the box unchecked.
I went to the moving square test pattern. The background was not black. It should be!

I rolled back to #0730. The background on the moving square test pattern background was black as it should be.

I'm not a programmer, but I know enough about programming to be dangerous. I'm thinking that the problem might be a Unix/Linux Ownership or Permissions issue with autostart.sh There hasn't been any discussion regarding permission settings or how to set them correctly.

Is there a detailed HowTo available on installing this patch? Without detailed instructions, installing a patch will be a struggle for anybody without a programming background.

BTW, autostart.sh was still present after rolling back. Apparently, it does not get wiped out in the process of doing an update.