Comment 34 for bug 1251393

Is there any other good argument to make edge cuts in footprints impossible to define from within kicad or is it just that nobody wants to change the current behavior for v5.1?

If there is a good argument to be made then we would not be allowed to have any footprint in the official lib that defines an edge cut layer. (Coming back to the original question) As far as i can tell (from this discussion) this is not the case and we are allowed to have such footprints in the lib with some restrictions applied. (The outline in the footprint must either be closed or the endpoints need to be on a well defined grid to allow easy connection to the user defined outline.)