I added a bit of a draft that might be able to be slipped into 87 as it exists now: http://dw-docs.dreamwidth.org/28420.html?thread=255492#cmt255492

This link format will work with some other sites that are not LiveJournal-based. Adding "site=sitename" in the tag will create a link to sitename/users/username and sitename/users/username/profile. If Dreamwidth does not already have an icon for the site, the generic remote site icon will be used.

(examples:)

archiveofourown.org
example.com