Tomboy

I think it used to be possible, fairly certain i had removed it.

Not surprised that Gnome help doesn't have how to remove or add toolbar buttons or otherwise customize the icons on notes.

But i am surprised that https://help.gnome.org/users/tomboy/stable/index.html.en does not say anywhere how to get involved at all, how to contribute, nor how to ask for help or support.

Eventually found this:

Should be quite possible as Tomboy notes are saved in XML; not finding anyone doing it.

In Drupal, it would make sense to make Tomboy notes their own content type, so they could have their special linking, but full web content with pictures and taxonomy and all that good stuff would be separate, and could reference/include Tomboy notes.