NoD Said
No need - we have Flaps Controls & Indicators etc in the cockpit. I am unaware of any accident where the Control and Indicator said the Flaps were deployed, yet they were not
This is exactly the point!
There are already at least three ways to interrogate what the flap setting is: the lever, the gauge and the TOCW.
*If* these inputs are overlooked or not verified then the reason for this needs to be addressed, rather than merely adding yet another input. If the crew are already this far behind the aircraft it could just as easily be another oversight, in another system, that gets them. Fixation on a single symptom doesn't really get to the root cause of the problem. That said the final quick flaps/trim/spoiler "killer item" check is now firmly imprinted in mind (airmanship!)
Extrapolating a bit, and ignoring CC checking flaps or flight crew hanging out the DV windows, say Boeing decided to add CCTV to every external surface on their next model so that the crew could visually check the flaps and gear etc. Would a rushed flight crew or a stressed flight crew or a tired flight crew, who has missed the earlier indications really take the time to look?
Absolutely no inference is made or intended to the particulars of the Spanair incident by the way. This is purely an academic exercise.