Can you add a brushes used list, drag and drop separate window, to each file?

Can there be a way to log what brushes are used, and keep it in a separate window, or a drag and drop feature to easily store the brushes used for a particular peice of work? If it could  automatically open when you open your file, this would be incredibly helpful to not have to go scrolling through everything.
It would be nice to have the brushes you use in a separate  window from the full list of brushes you want to pull from. 

If anyone knows of something like this that could be added, please let me know. Thank you.