For now, currently, i really dont like them.
But i know in the future, it will be something good.
First, i discovered that using certain characters as a separator in config.ini make Piwik think there is no config.ini file and it want to reinstall itself.
The following characters do this : | (pipe), ~ (tilde).
So i decided to use ¦ instead.
But if i set it up like that, the widget that list URL doesn’t fold them anymore
I think there’s need to have two defined separators now, or that the page url widget always use the proper folder separator.