Hi Brian, it sounds like "barb" is the right name thanks for researching it!

@Martin - I don't think it will be difficult to do it, I'll give it a try.

@Pilou, re:
> Will be fine to have a Node "Replace" function! (maybe yet existing ? )
>
> So you can replace any arrows selected by your own object!

That is a cool idea but unfortunately pretty difficult to implement. The arrowheads are drawn with some custom code and behave somewhat differently than regular objects, like they stay at a fixed screen size and don't get larger when you zoom in on them. To be able to customize them with a regular drawn object could be possible but it would probably need some kind of special editor that would require a lot of work to make.

- Michael