This might not be the point, because everything is tiddler based, you can open a layout tiddler on story river (sorry for sometimes mis-used as “story flow”):
This basically means if I want, I can also provide PageControl button to open it, but I just don’t want PageControl drop-down list to be too long, so I’m not providing any short cut to it. And let layout launchers to render the button.
Because we are going to have 10-100 layout based apps in our wiki, to cover all aspect of our live, to keep all personal data privately in the wiki, and inter-connected.