If you do this, you can also take away the UAV-option and give the commander the ability to look down on the place the plane is flying over at that moment.
I'm also thinking: why limit the spawn points? Just give the airplane a smaller action radius so it stays on one side of the map, this way, if a squad needs to be on the other side of the map to capture a point, they will rely on rallypoints and FOB's, because if they would spawn in the plane they would have to walk all the way.
If you're not going for a plane that's constantly in the air:
You could Code a plane that does a high-alt, high-speed fly-by like every 10 minutes in a straight line or in 1 circle. You can announce the comming of such a plane by text in game, just like the notifications you get if a weapons cache is destroyed in insurgency.
Squads will have to react quick to drop where they want to drop, and the plane will exit the region very quick after its entrance. (You could also take away the 10-min. timer and make it a commanders asset, like you do in suggestion 1).
anyway: I like this idea very much and hope to see the para's in a suitable map soon
![Smile :)](./images/smilies/icon_e_smile.gif)
Good luck on the project!
Greetings,
Red Feniks