I have been using Neck diagrams for 2 years now.
I'd like to suggest these features (or be helped find them if already exist).
I believe they could make life more easier.

1- Add a preset signature of text, link or image that can be attached to any diagram in a pre-defined or custom position.
2- Have a global option to automatically export a left-handed version of diagram while being exported normally, that could have some suffix added to the output file name.
3- Ability to include clickable links in PDF version of exported diagrams.
4- Ability to customize keyboard shortcuts.
5- Ability to export multiple diagrams at once in both image and pdf formats with saved diagrams file names.

Thank you.