Toggle the numbers, add TOC button to Headerbar

[revast]

While the Plugin works fine most of the time, it would be great to have a means to disable showing the numbers, and just have the titles in the TOC. Can you point me please where in the code I could achieve that?

It would also be great to have the TOC toggable via Headerbar, I guess I could write a Plugin just for that, maybe you could also point me to the right direction.

Thanks for all your Work!