Hi Poison.ivy.maze!
I initially created this tool out of frustration with existing PDF editors, so accessibility features like document tagging weren't something I'd considered at the time. That said, it's an interesting idea, and I'll definitely look into what's possible.
The project is completely open source too, so if anyone wants to contribute a PR for something like this, I'd be more than happy to take a look and merge it if it's a good fit.
Thanks for the suggestion!