Hey all. This is my first post. Yay!
My suggestion is to add a control on the page options to allow for diagonal distances to calculate as 1.5 the distance of a horizontal or vertical distance. See my two pictures below; I'm using one of my pages as an overland map (we're playing Dark Sun and the players have their own siltskimmer pirate ship).
Note here that the horizontal distance shows as 80 miles.
And note here that the diagonal distance also equals 80 miles. In reality, the sailing distance to Altaruk should be 120 miles.
So yeah. A choice to enable real diagonal distances would be preferable for this kind of purpose. I think D&D 3e players would also prefer it as those rules stipulate that travelling diagonally from one square to another counts as 1.5 squares.