I would imagine it wouldn't be too hard in terms of code - if there is no date of death, on the next page you could be asked to fill in a few optional fields, such as: Official website, Facebook, Twtiter, YouTube, Vimeo, SoundCloud, MySpace, Blogger, LinkedIn, Google+ (to mention the most common ones).
All the composer-page-creator would have to do is to just paste the link into the respective field, and then in the composer's page there could be automatically-generated links with an icon that links to the page. (Something like the image I've uploaded, an "artist's impression" of the feature, I guess
) (I just used the first icons I found, for sure we can find better ones.)Also it would be nice to create an IMSLP icon that can readily be used on other websites, to make cross-linking easier from other platforms to IMSLP.
Any thoughts?
(Also it would be FANTASTIC if living composers could be separated from "Modern" composers and had their own category, so that they can more easily find and communicate with each other. It might also be interesting for performers to be able to find works only by composers who are still living - in some examinations, for example, this is a prerequisite, that they perform a piece by a living composer. But that's for another topic.)