JNF has not been (generally) released yet. I believe there are changes pending to the public editor before it will be due to reliance on specific WME code being present as it overloads the 'q' shortcut with additional functionality. We're trying to get Waze to add this functionality to 'q' by default.
The highlight script doesn't actually fix it. It's telling you the keyboard shortcut for "disallow all turns" = Q .
If you're fixing a reverse connection node you can sometimes use the Q and then W key combo (press Q to disallow all turns, and W to Allow all turns) then set the turn restrictions manually. Doesn't always work, sometimes you have to disconnect the node and then re-connect it.
Check youtube there's a couple of videos on how to do it.