Give edge tool a vertical AND horizontal element so it can be used like a tee-square and triangle.
Alfredo Irisarri commented
Yes! something like the use of shift key in Mac programs like VectorWorks.
Hi Roy, thank you for both of your comments here on our Uservoice forum. We're definitely working on some specific improvements to the Straight Edge that make it work more like a tee-square. For example, we're working on a gesture that will make the Edge flip 90 degrees from its current position. Other designs are considering variations on true tee-square functionality.
Have you seen a tee-square tool in another drawing app that you really liked? We will take a look at it for ideas.