I thought about something like this too. I am a bit worried though, that this would run into the same issues as the asset usage counter in the media browser (Scaling problems when calculating asset usage).
What do you think?
That is very kind! 
Thank you very much 
This definitely is a step into the right direction.
Would be nice indeed! Would you create a new package, or may I create pull requests into your package?
I also have time to work on this at my workplace, so if you have anything particular in mind, let me know 