It would be awesome if when I drew two rectangles using the shape tool, Goodnotes could recognize one of the shapes has an intersecting border with the other one, and combine the two shapes while just keeping the exterior borders.

Or, instead of automatically recognizing the intersections, create an "erase up to intersection" option for the eraser specifically for shapes.

This could also be used to create a wider variety of shapes without having to program in recognition algorithms for semi circles, plus signs, ect.