From what I'm reading, and speaking for myself as well, there is a demand for switchable dual boot option. Presently you press left to go into the normal OF. But the default behaviour should be switchable. A simple file in .rockbox called whichfirmwaretoboot.cfg with a 0 being normal rockbox and a 1 being OF would satisfy the demand and eliminate the existing code splits on the sansa platform just to get this "retroboot" loading feature.