It’d be possible to automatically cycle inputs e.g. after 1 sec of sync inactivity. However, the list of cyclable inputs would need to be user-defineable, so that each one of the 9 inputs/modes can be included/excluded separately so that e.g. RGsB and YPbPr don’t get mixed as mentioned. In the end, I’m not sure if the end result would be that helpful taking into account the configuration effort required from user, but I’ll put this into consideration nevertheless. For PS2, the best way to remove this annoyance is to mod it to output RGBs regardless whether it is in HD mode or not.