I like the idea of 'fire rate 2' for fighter weapons - like JLS did in AIC. First, it makes fighters fight more 'realistic': they fly over and fire on you then regroup and fly back. Something we usually see in war movies
Second, PD would now have TWO chances to shot down fighters during the raid - on the way in and out.
That alone should make PDB more usefull even without increasing the damage which would otherwise affect missiles !