[Gh0sT_]

Set that heli Z coordinate(when you are creating it) +5

Example:

CreateVehicle( heli model, x, y, z + 5, color, color2, respawn_delay );

And for the player:

When you putting anyone in jail, freeze the player for ~3 seconds, set a timer with 3000 interval and unfreeze it when the timer gets called.

Example:

(Putting player in jail)
TogglePlayerControllable(playerid, false);
SetTimerEx("Unfreeze", 3000, false, "d", playerid );

(Timer)
forward Unfreeze(playerid); public Unfreeze(playerid) return TogglePlayerControllable(playerid, true);