> In an ideal system there would be a wiki with every option documented and when hovering over the option you'd get a short explanation and a click is a link to the documentation.

doesn't even need to be a wiki, because programs should contain their own help files! Like how commandline programs are encouraged (by command arg parsing libraries) to include the documentation in the very code that parses it.

Whoever that added those config option should also document it, preferably right in the code so that automatic generation of docs for the UI is possible (and ensures that it matches the version you're using).