Not yet. Think I could add it in without much pain but lemme think about it what’s the use case?

1) bookmarks for graysky, plan is to be able to save bookmarks to an external db then a custom feed to fetch them :) 2) integrating @poll.blue - would be cool to authenticate votes

Obviously the risk with bookmarks is that while you might not be able to read entries without being authed, since you can auth via custom feed, you would be able to create bookmarks which is an avenue for abuse

get/putPreferences may be able to help you with the first one https://github.com/bluesky-social/atproto/blob/main/lexicons/app/bsky/actor/getPreferences.json I think as a rule of thumb, keeping all user private state on the PDS & reusable across clients is a good rule of thumb