I searched the forums, and couldn't find much regarding the IECCs. I apologize if I missed something.
Our city has adopted the 2021 IECC. I'm hoping the great people at Chief are working on a library for the IECC. For now I am using notes and schedules to indicate the 3 way dimmers as well as the auto off exterior lights, and any other required electrical I can't find in the library. It would be so nice to be able to just choose them from the library. Even if we don't get an IECC library, I love this software!