As of rev d1cce89 in devel, all Leo docs except the central widget are floatable. If you drag a dock away from Leo's main window, Leo (actually Qt) will restore the floated dock when you next reload Leo. This is a significant improvement to Leo. Clearly, we want pyzo's docks to be floatable as well.
I am making this change in devel because it should be tested widely. In the unlikely event there are problems, I'll just set the floatable_docks switch in plugins/qt_frame.py back to False.
This switch probably predates the --init-docks command-line argument. I can't think of any reason why anyone should be afraid now of allowing floating docks. Let me know if you find a real problem.
Edward