Public Robofont extensions not included in Mechanic?

This has been on my mind since you posted this last month. Going through the results of a quick search on GitHub for info.plist files that contained the keys launchAtStartUp and addToMenu (https://github.com/search?p=1&q=launchAtStartUp+addToMenu+filename:info.plist&ref=searchresults&type=Code&utf8=✓) yields 10 pages of results, of which I've found:

• TypeFacet by Matthew Chen
  https://github.com/charlesmchen/typefacet-robofont/tree/master/extension/TypeFacet-RoboFont.roboFontExt
• StringSmash by Béla Frank
  https://github.com/BelaFrank/StringSmash
• Interpol Steps Preview by Lukas Schneider
  https://github.com/luke-snider/robofont-extensions/tree/master/Interpol_Steps_Preview
• Cyrl Rename by Alexander Lubovenko
  https://github.com/typedev/AfiiToUni/tree/master/Cyrl Rename.roboFontExt
• ControlBoard by Andy Clymer
  https://github.com/andyclymer/ControlBoard
• SpaceCenterKernCheck by Joancarles Casasin
  https://github.com/casasin/RobofontTools/tree/master/SpaceCenterKernCheck