Hey Jack,
The main issue with pulling the content out and re-nesting is one of formatting. While that certainly would be a solution, the fixed elements are part of a larger format that does not lend itself well to simply popping it out of the draggable instance. When I lose the draggable instance and go with a native scroll it is just a matter of adding the correct class at the correct scroll position. I will post up a draggable solution if I work one out.
Awesome utility though and I still use it in several locations.