Actually, yes. I cloned the layout $:/core/ui/PageTemplate (which can then be chosen in Control Panel → Appearance → Layout) and added the line
<$messagecatcher $tm-navigate=<<additional-link-actions>> >
inside the $navigator widget (and its respective closing tag).
In a global macro additional-link-actions I do the folding / unfolding, and some re-sorting of newly opened tiddlers in the $:/StoryList, since they were all being appended at the end when the clicks were intercepted by the $messagecatcher. I can post the macro here if you like.
No core tiddlers were touched.
Have a nice day
Yaisog