Frankly the last thing we need is a bunch of beaurocratic muppets like the cad sticking their oar in. There is only so much you can legislate for. A train driver could arguably cause as much damage ( save the AWS sticking the brakes on and that can still be overridden ) and the arse in charge of the cruise liner gave it a damn good try.
Every section of society suffers from depression and psychosomatic illnesses and pilots are not exempt. It has probably been ever thus. You just have to trust in the non invasive judgement of the avmed doctors ( who hopefully know their subject [and subjects] and can make a reasoned judgement on the day of the medical. And the support of your peers to suggest that you step down for a bit ( without stigmatising the individual). Relying on the individual themselves to 'fess up is asinine at best. The few that have done so have been treated like pariahs in our profession. How many individuals have you sat next to who probably should not have been at work that day ? Be it wife trouble, pregnant girlfriend trouble (possibly at the same time ), kid problems, housing problems, bad financial deals, to say nothing of the stresses and strains that our profession and our employers place on us. Are you going to catch every bad apple ? Certainly not ; the alternative is persistent invasive psychological testing which is hardly expedient and whose results are moot at best.
As regards the door. A knee jerk reaction to an FAA mandated requirement which airlines stumbled over themselves to implement. Adopt the El AL approach; move the door further aft so toilet and galley access is possible without leaving any one individual with sole access. You might lose the odd bog on some of the smaller aircraft. Tough. Small price to pay.