You know that thumbnail bar overlay that says things like "WEBM", "Thumbnails not yet generated", or identifying the tag that caused a pic to be spoilered? Those could be turned into a customizable feature of filters. A list of tags that generate the overlay bar - not causing things to get spoilered - just to convey some information faster than hovering the thumbnail and scrutinizing the tooltip.
Barring that, I propose that [edit](/tags/edit) and [machine learning generated](/tags/machine+learning+generated) be added as overlays.
(I am currently using custom CSS to achieve this feature.)