[Feature request] Enhance browsing as guest

It would be nice if browsing an instance as guest would allow post bookmarks, and mark scrolled posts as read and hide read posts, then if possible a feature to export those preferences (at least the bookmarks) locally. The problem arised when i couldnt get an account for Lemmygrad and wanted to consume its content, browsing as guest didnt allow posts to be bookmarked, alsoread posts couldnt be hidden so each time i browse as guest i get the already seen posts. Seems fancy but would appreciate if implemented. Thanks a ton.