Allow searching assignments by tags and categories

I’m now playing with the Assigned plug-in and am loving it but missing one crucial feature, searching by tags.

I tried to do this by using the search syntax of tags:tag-name in the search bar on an assignment page (where it says Search by title or post content, but that didn’t work.

I have the same request for categories.

Ultimately though, I think it could be wonderful for the Advanced Search dropdowns to be available, too, or at least the most helpful ones.