Hi Magnus! Recently I've been looking at quite a lot of geographical categories on Commons.
A nice feature extension to WikiShootMe would be to highlight a particular category (ie the wikidata item associated with it) in yellow, and images associated with it. This would make it easier to find images that ought to be associated with the category, but haven't yet been placed in it.
WikiShootMe is now directly linked from the wikidata-powered infoboxes on Commons, which would make the feature particularly useful, if the category could link highlighting the images already associated with it. Thanks!! -- James.