carry additional fuel and perhaps be overweight and cop the wrath if you get ramped,
Neville, Sorry mate, but you should take a look at the dispensations for weight on international ferry flights in light to medium aircraft. These things are miles over MTOW and its all fuel. Been there done that.
So PA39, what do you compromise to carry this extra weight?
I'll have to speak to CASA to mandate all MTOWs be increased as it must be perfectly safe to do so from your comments.
If you then arrived at your destination above MLW would you hold before landing? What if weather was approaching?
Its a ridiculous comment to say that you would compromise aircraft performance on a normal flight because the aircraft is marginal on that route for fuel. If you can't carry enough fuel to do it legally then don't do it. If the destination is known to be marginal have alternates available en-route and get up-dates on the weather enroute.
Ferrying is a completely different prospect and only operating crew are subject to the dangers.
How far above maximum weight could you go before all single engine performance is lost and you face ditching on take-off due to a failure?