I'm making an external which draws graphics into picturedata. One setting it has reads information about the draw graphic it is targeting. So given the name of a graphic, it can find out what type it is e.g. Oval and adjust drawing automatically for that shape type. For roundrects, I can always add an extra parameter to pass the external the roundwidth and roundheight. It would be useful to have access to these properties in the Internals Toolbox at some point, however.
All the best,
Externals, projects and software made with SC: