Yes, I expected this to be the next thing asked, and will have something soon - haven’t had time to work on it yet, but it’s not too hard. Just needs an extra command line input.
This is a good idea. Actually neither rhinoscriptsyntax nor RhinoCommon have a compact way to create a rounded rectangle, but a custom function can easily be written. I will include this in the next version. Again, one more command line input. Not sure how well this will work with kinked corners though.
This is somewhat more complicated, I will look into this at some later date.
–MItch