change of jailkit default/site section addition/override and location
it's not particularly clear when looking at the jailkit settings on a website options page if any settings configured there are in addition to the default server jailkit settings, or completely override them, so only sections in the site settings get applied.
it's current location also means that admin intervention is required whenever a client wants a particular application added to their site's jailkit, either to add the section to their sites jailkit settings (or to remove it at a later date), or to add the application to the servers jailkit settings so everyone gets the additional application whether they want it or not.
it may be a better option to move the site's jailkit settings to the ssh account creation/settings page, and have additional sections made available for selection by the client user, just like apache or php directives are.
discussion on howtoforge forum: https://www.howtoforge.com/community/threads/quick-question-about-website-jailkit-options.86557/