OptionalbrowseList every result before anything is typed, for short lists such as tags.
OptionaldisplayLists results as the forum's search does, e.g. core's
GlobalUsersSearchSource. Each result's data-id is looked up in the store
under the source's resource.
Makes a field a picker: the member searches the way they would in the forum's search, and has to choose a real result, whose params are stored.