Correct me if I am wrong but he has said that this should work between any two sense and ge rom combinations.
I'm assuming the system partition is structured differently in ge compared to sense. I'm assuming as well that this switch is hard coded to setting up the ge partition data or the sense partition data specifically when switched to that choice. I hope I'm making sense.
Point is I'm thinking this will only work between a ge rom and a sense rom. To have this work between two roms of any kind our phones can support I'm not sure will work. We'll have to wait for Paul to say something.
Anyway, just woke up moments ago. I hope this made sense :-\