Get special comment styling for editors

Hi,

I am facing a small issue styling comments for a custom theme: I would like to be able to style comments differently for all users having the “editor” role. However, as far as I know only 2 dedicated css classes exist today:

• byuser, for all registered users
• bypostauthor, for the author of the entry

Is there a way I could manage this somehow?

Thank you for your help!

Source: Core comment-template file in trunk