1- raphael and grappo would be a great addition to the game. it might be possible to get off the helicopter with a raphael, increasing the tactical possibilities.

2 - vision inside the helicopter of 6 people

3 - possibility to revive ally during the flight

4 - pull ally by the vest to be faster or avoid dying when trying to catch the injured ally as shown Walker pulling Nomad

5 - camouflage color could interfere with ease of detection

6 - cold and heat should interfere with the body by forcing us to use clothes for adequate temperatures

7 - hunger and thirst leaving our character more tired and exhausted and forcing us to eat for energy

8 - snipers hiding in the woods hunting the ghosts

9 - hunters hunting ghosts and quick time event when they try to stab the ghost leaving the shortest reaction time in difficulties as an elite

IMPORTANT TO RENEMBER: many players don't like hard difficulties. so additions like survival and camouflage should be optional so as not to affect other players