I just noticed that it is impossible to escape choppers which are submerged under water after an emergency landing for instance, also I noticed that the character dies whitin secounds after the helicopter is submerged which is simply unrealistic in my opinion.
One thing that I've seen in the comments that I find to be worthy to be added as well: make it possible to jump out of a helicopter if it hovers close to the ground, for inserting divers and similar things.