[.041 Safety Wire]

I don't know if you've done your research much on this... but this would have never gone into production no matter how hard anyone tried. They did carrier testing for the mustang, and the test pilot (Robert Elder) loved it, but the problem with that plane was that there was less than 10 mph room for error. You go too slow (82 mph), and you stall out, you go to fast and you'll snap the wire (90 mph). It wasn't a feasible aircraft to go into production because not every pilot would be able to land it, and even in the best of hands and bad weather it would have eaten something. The hellcat could easily out-perform the mustang in carrier operations, and this being 1946 means that the 1945 bearcat, which went into production and could fly circles around the mustang would be readily available.

all of this is not to say I wouldn't want to see the navy modified P-51 in this game.
P-51D-5NA (S/N 414017) was tested just outside the Virginia coast aboard the USS Shangri-La

I agree with most of what you say but I dont believe that a P-51 at 90 mph would snap an arresting cable. The cable arresting system is not a fixed cable across the carrier deck they run through a series of sheaves and down to the arresting engines that are located below the flight deck. The arresting engines act as shock absorbers during the trap.