On my flights I attempt to sit at the exit row and understand the duties should I need to open and assist.  With that in mind should we have specific seats designated for "Passenger Assistance".  We would be trained, certified and insured to assist the flight crew when given a call.  We fully understand that we may be placed in harm's way and this is something that we will accept.  Why?  I'm not that benevolent towards others, but I'd rather be in a position to save myself and as a collateral benefit to save others.  Oh...and I would be given a lifetime travel pass! :)