This worked great, thanks! I'll bring it up at the next team meeting (on IRC), the question of whether we should turn this on by default for all styles. IMO, it's worth doing with the 4.2 release.
Thanks Brian for integrating the patch into RF 4.2.0 !
Rounded border is now available out of the box.
We just need to create a simple skin (skin.properties file) with
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