I have never seen that option. To do vertical shots, the Mavic 4 Pro does "true" vertical shots, meaning the gimbal rotates to do so. There is no need for a vertical crop.
I have definitely had birds attack my quadcopters dozens of times (over about 15 years of flying).
The easy ones are actively nesting birds, like swallow, kites, and some sea birds, but they give up easily when I fly away from their nests...
You have nothing to lose by keeping the drone hacks firmware. It makes a better drone and flying experience. By going back to DJI, you could expose yourself to some unwanted firmware updates that sometimes do more harm than good.
This is just my...