The variables that free users can use overrides for are the *_HEAD, *_TALK_READLINK, *_TALK_LINKS, *_OPT_ITEMS, *_DATE_FORMAT, and *_WEBSITE. Paid users can override any variable.
By specifying which overrides can be used by a basic user, we may be able to prevent some Styles support requests.
[Dilberting and or commenting about my getting I1-Styles (ie: being tagged as responsible and capable of doing work) and my subsequent FAQ improvement suggestion (a method of preventing work which I would be responsible for) may be ignored. The irony does not elude me. Thank you. :)]