I'm not disagreeing with anything you've said Aries, but I don't think the way to increase the likelihood of wars is to make them more complex by adding even more variability to it, the game is tedious enough.
As for DMB hitting cruisers, I don't understand the justification for there being just this one type (at least that is effective) of weapon that doesn't get a response from air D and AAB/DMB. I think there should be air support from navy ints possibly or instead of air, have defensive navy units with destroyers/etc. that respond to navy's in the same way that air D responds to air/land attacks. Or, as I suggested, keep it simple and just have heli's attack them like they used to.
As for garrisons, they're too small as it is much less with another added battery.
I agree on offensive missile batts (LBCB/Conv), they have a longer range than the heli's and def batts that attack them in defense which makes zero sense. They should only be defensed by MIB as it would be in the real world.
All of that being said, the original point was what about what would increase PvP war and I've posted this elsewhere but I'll add it hear as well:
The war levels have zero to do with the fact that there aren't more wars, it's the following:
#1 Can't trade cash for GC
#2 Can't sell pop down to 20 mil
#3 With quality/mobile units defense is WAY stronger than offense
#4 Because of space there's no way to tell what your enemies actual defense is
#5 Because of space there's no way to know that the enemy will not just strip out their country during the war if they're losing
You'll notice that there are many players at war levels that are high enough to actually engage in PvP war, but none of them do it and it used to be that all of these people would be sitting with WP on. Now, they don't need WP because they know all of the above is true.