I would like to be able to create a circle when using the "Permanent Darkness" and similar tools. Currently, only rectangle and polygon are allowed. This would be useful because a lot of spells (most of them, actually) in D&D 5E that create "darkness" create spheres of a given size. For example, the 3rd level Darkness spell creates a "15-foot-radius sphere". I see that the "drawing tool" allows the creation of a circle, so why not the "darkness" tool?