By the way I created another microaddon to streams: The Streams Sidebar
$__plugins_JJ_streams_usernotessidebar.json (1.8 KB)
It gives you a dropdown to choose tiddlers (from the story and already with streams) and add notes in the sidebar. This is better with a sidebar-resizer, of course. It even can automatically resize the font-size of streams in relation to the sidebarwith.