group chats - default option for "minimized on autojoin"
bookmarked groupchats are by default not "minimized on autojoin". this could be annoying if you have many chats. It would be fine to be able to set a default value for it, maybe in the advanced configuration editor.
You talk about bookmarks that are created in the join groupchat window? When you check "Bookmark this room" and "Join this room automatically when I connect"?
In this case, what about just activating minimize on autojoin when both are checked?