I've been asked to pass along this survey that is currently running regarding usage of music scores, which I understand is to provide feedback to music publishers and content providers. The questions seem interesting, and IMSLP will also have access to the results, which may be helpful in making improvements to the site.
https://www.snapsurveys.com/wh/s.asp?k=142901933230
Music Usage Survey
Moderator: kcleung