on any part of the site it is not possible to scroll the left frame/navigation panel.
examples: i have many saved filters, to be able to select the last one i need to scroll the movies all the way to the end until also the left side scrolls.
when on any movie detail site you have to scroll movie description and comments all the way to the end befor you can see the info in the left frame of the site.
Yeah, this is how the sidenav locking plugin we have currently works. It also depends on your vertical resolution. One idea I have is making the individual sidenav sections collapsable to help reduce the height.