RoboHelp 8 included the SaveAsProjectTemplate.jsx script. RoboHelp 9 included the same script renamed to Project Template Generator.jsx. RoboHelp 10 works with custom project templates, but doesn’t provide a way to save them.
This was the conclusion of an hourlong web chat with an Adobe representative. Importing Project Template Generator.jsx into RoboHelp allowed me to update my project templates, although I would like to see a RoboHelp 10 patch include a way to save project templates without this workaround.