void TASK_ENTER_VEHICLE(Ped ped, Vehicle vehicle, int timeout, int seatIndex, float speed, int flag, Any p6);
speed 1.0 = walk, 2.0 = run
p5 1 = normal, 3 = teleport to vehicle, 8 = normal/carjack ped from seat, 16 = teleport directly into vehicle
p6 is always 0
This is the server-side RPC native equivalent of the client native TASK_ENTER_VEHICLE.