Theses bootstrap and fallback relays are actually needed, but the setting can be very confusing for the average user. Since you already build it, keep the interface, but move it behind an "Advance settings", explaining that the default are usually sufficient.

In addition I would by default make this interface read-only, explaining that with this setting defaults can be automatically updated if necessary. The user have to enable the custom version to edit the lists, and should so take care of keeping them updated.