hi Alex,
In a sense, it can be "disabled".
The "force landing" procedure is kind of safety feature..... to prevent the drone falling out of the sky when the battery is completely out (not just 0% in the meter, voltage so low that the motor can't work anymore). And there is another safety feature in place that could override the force landing: the Obstacle Avoidance (OA). If it senses something below it and consider the terrain not suitable for landing, it would hover until the battery is completely out and then it drops.
Both are very essential to a safe flight. I don't see why DJI would allow the user to change the setting.
Software-wise, I think it takes high level modification of the Apps and firmware. It would be like disabling the ABS in braking system for a car. It 's possible for skilled machnics, but not by regular driver. I assume you and I both unable to do this, otherwise, you won't ask about it in the forum.
Alternatively, you may be able to "trick" it. You can hang a small stick under the drone (or anything else), best if it can swing a little (otherwise the OA will disregard it). When it "force land", it would detect "obstacle" below and stop the descend. I tried it indoor and the drone hover but did not land, even when the battery drop to 0%. I then manually land the drone. I must add that the OA is a bit tempered so sometimes it re-cognize things, and sometimes it doesnt.
Of course, it would cause risk. For instance, the "obstacle" would de-stable the flight and the drone would be prone to hook to tree branches (you mentioned flying over mountain). Certainly, the weight of the "obstacle" would drain up the battery faster, so it may just shorten your flight time.
Certainly not recommended this method to regular pilot but if you are sure what you are doing, take it at your own risk.
May be if you can tell us more about the purpose / circumstantial of your flight, others can help you better.
