One fun experience I had in JWE was handling dinosaur breakouts from the ranger teams instead of the helicopter team. It was fun as you are restricted to driving around the map instead of flying over all forms of obstacles when handling a dinosaur breakout. Time was a big factor as you had to navigate your park to reach your target ASAP, and have the risk of being tackled and destroyed by any dinosaur in the vicinity.
I would like for the ability to tranquilize dinosaurs to return to the ranger teams. It could be a researchable item upon building your response facility and incubating your first dinosaur, where after being researched, your Ranger team could now shoot tranquilizer darts. This could also be applied to the medical team as well, whereupon building your Medical Center and incubating your first dinosaur, they too could be open to tranquilizing dinosaurs as well.
To make matters more interesting, I think there should be the option to disable the helicopter unit in custom challenge mode. That way, the player has to be resourceful with their ranger teams in order to handle any chaos and build parks that would allow for easier access for your vehicles.