If you want the second line to work, just move it to be above the first line, so that .L gets looked for before the default match.

For your other problem, '.S' on a null (ffffff) entry doesn't work.. but I'll put it in v146 for you, as of... now!

Also new in v146 is SITE RO/RW now loop over all ext2 filesystems listed in /proc/mounts

Cheers