Hello Mark,
Well yes, I use them in my Tiddlyshow App.
When I click on presentation mode (full sceen + zoomin) I can navigate by forward/backward buttons. On the exit, I switch back to classic story view (or what ever story view before presentation mode).
If you back to classic story view, the top tiddler in story river (e.g. the first in $:/StoryList) gets focused but what you left was the current-tiddler in $:/HistoryList. So there is a confusion when you switch
between zoomin and classic (or popup) story view.
If you click a link, the HistoryList always get updated, but the update of StoryList depends to the link you click! If it was already somewhere in the list (StoryList) nothing will be happened!
Mohammad