Some of the things you are describing can already be done with search filters on the Identify page!
For example, here are all the observations from genus Syrphus (just at the genus level):
https://www.inaturalist.org/observations/identify?taxon_id=52489&lrank=genus
(If you click on “filters” you can see how I did that.) You can also use search filters to look for observations that have not been annotated yet.
Also check out this tool (it’s a browser extension):
https://forum.inaturalist.org/t/announcing-the-universal-metadata-tool-beta/53182
It’s unofficial, but it would allow you to easily create a button to click to automatically identify the species and annotate it “male”.