Square option for the write-on tool

I animate explainer videos for a living and Première Pro is my favorite program to do this in. The write-on tool is one of my most used tools when it comes to whiteboard style videos. Right now it's only possible to trace with a round vector, I would love it if there was an option to chose a square vector as well.

In these pictures I want to let the arrow appear using the write-on tool with the Reveal On Original setting. If there was a square option it would be able to follow the arrow much more accurately. 

Of course there are more ways to achieve this but I thought a square option for the write-on tool would be a nice and easy to use addition. 🙂