So, yes, it is possible to limit AI visibility in the game, and most of the work is already done. It was a massive amount of work, and one of DT's triumphs for which I am eternally grateful.
The only problems we've got left with regard to AI visibility is that they still seem to be a bit too good at detecting distant aircraft, correctly ranging distance, and keeping track of aircraft when they lose sight of them.
We might complain about current AI abilities, but DT has actually made MASSIVE improvement compared to what AI used to be like.