It would be helpful to be able to "stack" multiple saved filters, so that a user could apply multiple, orthogonal criteria at once without having to create a cross product of defined filters. For example, if records can be either "current" or "past" and either "material" or "immaterial," a user might want to search for "current material" and "current immaterial" and so on without creating four saved filters.
If the filter selector allowed selection of multiple saved filters at once, that would allow a user to easily compose such a query with just two saved queries.