this is a good widget and I am grateful for it. I am using it and with a couple of tweaks it works logically.
The first tweak is that I needed to display:none the a: title of the parent page in the outputted sidenav. For some reason, you don't get an option to hide the parent of the child pages, so you gotta do it with css unfortunately.
Secondly, don't bother putting in a menu title, cos it bugs out and appears with no space, infront of the parent page name. you'll see what I mean when you try it yourself.
Otherwise, it works and works well and could be perfect with a new version or two.