There is a topic about filtering by number of IDs https://forum.inaturalist.org/t/sort-observations-by-number-of-identifications/3603, if that helps. There is also a topic devoted to URLs: https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki/63/214 which you might want to take a look at to see if anyone has brought this up before, or, if not, to possibly get some help.