It sounds like what you want is to be able to make a custom list for your Location Name quick filter, but without filtering out all the members. This would be a feature request that I would recommend adding to the Ideas section!
Thanks for your response. That is exactly what I'm trying to do: create a custom filter for a subset, leaving the rest of the set default-selected. Somehow (and I'm not sure how this happened), I created a custom list but the points not included are lost when you de-select from "All". Sounds like the list would have to be left in its entirety to work...