You can cheat your way into P&S mode, somewhat:
CFn1.8: 2 (Enable ISO Safety Shift)
CFn1.12: Set lowest shutter speed to 1/60
Your burst buffer counter will drop like a rock, on the risk that it'd have to go to ISO 3200 where the buffer is quite short. However, it'll save your butt (by not giving you a horrendously long hard-to-handhold shutter speed) yet leave it easy to override (disable CFn1.12 and just reenable it when you're done). I've used this to hand my camera to inexperienced folks.


