You can register locations as a Custom Location via the MCM. However, you must be IN that location in order to register it. Additionally, I recommend NOT registering an interior such as the Bannered Mare, Braidwood Inn, The Arcaneum, and so on. This is because the mod is checking your STRICT location. Whenever you gain fame, it will be applied to the first valid location it finds compared to your STRICT location and that location's Parent locations.

For example, if you are in the Bannered Mare, your parent location is Whiterun. Therefore you will gain fame in Whiterun, as it should be. However, if you register the Bannered Mare as a custom location, you will ONLY receive fame in the Bannered Mare (while you are inside), and not Whiterun as a whole, and your Bannered Mare fame will ONLY apply while you are in the Bannered Mare.

Therefore, I recommend standing within the custom City or Province (such as Bruma/Cyrodiil), and not one of its buildings or dungeons, to register a custom location and have it work in a manner you expect. That way it will apply to the surrounding area as well, not just that building. However, if you WANT fame to apply to that specific building or dungeon, then you can register that building or dungeon and it will work.

If you try to register a location that already exists in the location lists, the registration will fail.

Custom Locations display as "-EMPTY-" or "---" if that location slot is available. Additionally, Empty custom locations will have their Decay and Spread checks skipped. This prevents the code from checking empty custom locations, therefore making the code faster.

You may only have a maximum of 21 custom locations registered with SLSF Reloaded (this is mostly to prevent Papyrus overload when running the Decay and Spread functions).

When you Unregister a location, all Fame for that location will be deleted and the location will be removed form the list. The registered location list will also compact itself, meaning if you have 3 registered locations, and you unregister the location in Slot 1, Slots 2 and 3 will move to Slots 1 and 2 respectively. Therefore, in case it matters, you always know what order you registered locations in (Slot 1 is always the first/oldest, while Slot 21 is always the last/newest).