[Standards] Extending the roster item element

Hi all! With XEP-0469: Bookmark Pinning and XEP-0492: Chat notification settings we now have two XEPs that allow syncing pinning and notification settings across clients on the same account using the <extensions/> element of XEP-0402: PEP Native Bookmarks. Unfortunately, this now means that normal 1:1 chats (that are synchronized as roster items) lag behind. I'm volunteering to write a XEP adding an <extensions/> element alongside the <group/> element to allow arbitrary extensions for roster items. This would bring 1:1 roster items on-par with bookmarks2 and immediately allow XEP-0492 and XEP-0469 to be applied to roster items as well. But before I start I want to ask especially the server developers on this list: would you consider implementing this? If the answer is no or "some day far far in the future", it might be worth to try to invent some other mechanism that could be deployed faster. In my opinion, however, extending the roster items is by far the most elegant and simplest solution. What do you think? -tmolitor