I’ve suggested an idea for future wordpress builds.
The overall idea is that theme authors can see potentially see who is using their theme. This wouldn’t be automatic, and maybe there could be two options such as 1) send notification to theme author and 2) allow information to be displayed on authors’ website. I feel this could help notify users of any theme updates and also link them with people who have used the theme and modified it in any way.
I’m making a theme for portfolio websites at the moment so this would be a useful feature for me. Go vote!