This patch makes it possible to have on/off states for any line-guide. The default settings will allow you to have on/off states for every line-guide, i.e. each line active in the on state, or active in the off state. It also includes the fixes from Line Guide Acts-Like Fix. See the readme for more details.
Added the original authors of Line Guide Acts-Like Fix since ultimately, this patch is based of the other patch.
Definitively a nice patch considering it both adds custom blocks to line-guides.
There are some minor unoptimisations, though: Instead of checking for OnTable first and then check for OnTable or OffTable depending on the switch state, you could have checked for both tables immedietly at first.
It also would have been nice if you had added a DSC file. Sure, the behaviour is obvious compared to, say, FuSoYa's screen scrolling pipes (which also are inserted manually and don't rely on any block tool), but it still would have been nice if there were some descriptions for them.
Even more better than just having the reversed version of SMW's diagonal line guides where a left-facing-slope (goes up from left-to-right) is only active when ON and a right-facing slope (goes down from left-to-right) is only active when OFF.