This seems like a pretty obscure request, but I know at least for me it would be helpful to insert pictures as an annotation to a paper. I often find myself pulling tables and graphics from other works to assist with calculations preformed in a paper.
Alternatively, if you could add the option to add hyperlinks as annotations so that I can simply click a link rather than having to attempt to copy and paste a text link to the DOI or website I’m trying to access.