Russian paratroopers jump from Il-76s. The same can be done from a 767. And adding a bomb-bay can be very easy, so long as you aren't interested in making it pretty. A hack-saw and some hydraulics can get the job done while still confusing missile systems into thinking it's a civilian airplane.
Doesn't the Il-76 have a ramp even the commercial version? I don't think you can actually open the doors of a commercial airliner with the motors running as they are plug doors and rely on pressure difference to keep them closed. Even if you modified one so it could as I suggested before a commercial airliner flying low and slow when not approaching an airport is immediately suspicious so I fail to see the advantage.
The P-8 Poseidon was modified by a division of Boeing itself and the Focke-Wulf Fw 200 was probably designed right from its early stages with provision for military 'conversion' as a workaround for the Treaty of Versailles and was again converted by an aircraft company, not some A Team with hacksaws and a MIG welder.
The line between a tool and a weapon lies only in its application.
Respectfully Serenity this is the sort of unthinking idiotic sound bite I'd expect to hear from some moron trying to protect his right to own a 50 calibre machine gun on his farm. To what other purpose can a SAM or a Colt 45 be applied? Almost anything can be employed as a weapon and yet presently the most popularly supported option seems to be to get an actual weapon.
We do focus, primarily on weapon effectiveness, because it's absolutely necessary.
Has the idolatry of power and weapons reached such a point that they are in some way sacred from the incorporation of a mechanism to make them ineffective against targets they were never intended to destroy? What about anti-personal mines? What if they had a secured coded short-range signal where you could set them off in situ after the conflict is over? Is that unacceptable because of the infinitesimal chance the enemy could crack or intercept the codes and neutralize them before that point? Do you object to such an idea as (former?) military personnel?
What about the Geneva Convention and Hors de combat? Don't these rules / laws pertain to the ethics of confining casualties to combatants? In the case of flight mh 17 an indiscriminating fire and forget weapon is thoughtlessly launched against a totally civilian target, an airliner - not incidental casualties, not an overspill from a legitimate target - and destroys it and you are telling me with conviction that it's unfortunate but more important that the weapon destroys whatever it is fired at? You can't even discuss such possibilities without being shouted down?
THAT is the way forward. You can only change the world so much by changing objects. People need to be changed to make a real difference.
No I'm sorry I disagree with this to the very core. In all other domains of human problem solving BOTH approaches are being taken in harmony.