In another forum somebody answered:
A 'default' setup that relies on the correct stick being inserted, and the data in the same place as when it was written (in other words, outside its control) would not be able to work correctly 100% of the time.
But the ROM data will always be there...
If you want a 'personal default' setup, write one with the USB style you want, and place it at the head of every Performance List you make. Then it is always a snap to load it before you start playing.
In truth, the default setup is more there to set up things like MIDI Sets, Performance Holds, and other general things like Chord Recognition preferences, Dynamic Arranger settings etc.. Because you are going to HAVE to load a Performance List before you start playing (unless just basic noodling), it really is not much of a disadvantage for it to be ROM styles only. And it is FAR better than having your BK start up with an error message because you either have the wrong stick in place, or no stick, or you accidentally moved or erased the USB style of the default setup...