Terisa de morgan:
You can put it in the main part of any addon. I would recommend making a new .js in the addons folder with an 'empty' addon framework (just copy the code from an existing addon and remove all of its code, options etc), and adding custom settings such as this one there. That enables you to add some custom options in every build, while not interfering with any updates from the main repo.
Also, I didn't know there were still people who use PRS+ but not Calibre
sengian:
I see what you mean. It might not be so easy to implement though (imho anyway), so if you wouldn't mind, please add it to the feature req thread (
here)