Hi OSTexo - when I was referring to geometry what I meant was that a script can only build an arrow out of lines right now, because scripts can't draw something completely new on the screen, they can only automate existing stuff.

So if the kind of thing you're talking about in a filled in arrowhead that is displayed in 2D screen space - that requires a new kind of thing to be drawn on the screen, so that can't be done with just a script, it requires new stuff in the core drawing code. That will happen when I get a chance to work on the area of dimensions and annotations - it's not something that is easily done with a script though.

- Michael