I have forwarded your report to the Stardock support team for their review and recommendations.
Please keep an eye on this thread for any updates.
We really do appreciate your feedback, thanks.
I suggested the very same over a year ago and received the same exact response, seems to me it doesn't take a rocket scientist to figure how to put rounded corners on the tabs. When installed with custom themes Groupy destroys the entire look of the theme with it's razor sharp corners.
Don't hold your breath on this @RedSkyRoad