Allow "Open Files" to be docked to top of sidebar

I think the sidebar's active/open files list feature would be alot more useful (especially in projects with a big file tree) if there was an option to dock it to the top of sidebar, so it always remains visible instead of scrolling with the rest of the file tree. Optimally it would just resize vertically as files are added/removed from it (maybe have a max height setting too where after a certain point it will scroll itself.)

This would make it a more complete replacement for the tab bar, which I would prefer to hide, as vertical screen space is at a premium compared to horizontal space with widescreen monitors. And I'm the type of person that likes to see as many lines of code on screen as possible.

For a good example of this type of functionality, take a look at Espresso 2's UI (http://macrabbit.com/espresso/). Or even Chocolat (http://chocolatapp.com/).