the pages widget is great, i think an interesting feature would be to be able to see transitions on the folders which piwik has grouped together by path
if my site layout was something like this:
/index.html
/dictionary/word_1.html
/dictionary/word_2.html
/dictionary/word_3.html
it might be interesting to see how people got to any of my dictionary entries, and where they went from them, instead of having to look at each dictionary entry individually