@Young:
R1- SA Observation
Germany choses the Airborne assault troops R1 and uses them from Paris and Western Germany to get 4 extra infantry in a sealion attempt, making the over all sealion strategy just a little less risky.
4 extra German infantry in a Sealion invasion is pretty significant in my opinion. Maybe the UK takes Increased Production, as you project, but that may not necessarily make up for the difference.
This is a thought that just came to mind:
For Paratroopers to be employed, you must have air superiority in the territory which you are attacking.
Air Superiority could be defined as a couple things…
a) a greater number of attacking fighters/tacs vs defending enemy fighters/tacs …… not so great a method
b) at least a 2-1 superiority ratio of attacker to defender fighters/tacs …… better but not ideal
c) there must be NO enemy fighters or tactical bombers in the territory being attacked…… much better
Personally, I am leaning toward option ©. Very cut and dry, no counting planes. Also, this most approximates the actual conditions in which paratroopers were employed (that I know of) in the war. Air superiority had to be achieved if the mission were to even be considered.
Note that we are talking about paratroopers specifically intended as a combat strike force… e.g. Overlord and Market Garden, which is what the paratroopers at an A&A scale would be equivalent to.