The system sorts by kind alphabetically so anything before F will be above. Is this what you mean?
Try this:
http://totalfinder.binaryage.com/
Run it at start-up or manually and it modifies Finder. Under preferences>totalfinder>tweaks you should find a check box for folders on top. It also can show system files as an option. I think it used to be free but it looks like it costs $18 now.
🙁 14-day trial is free.
🙂