I'm all fine with putting a bit more logic into vehicles. Ways to improve their defense other than just HP and reps is great idea. That said if you make swarms even more useless, no one will use them any more. What most vehicle users seem to forget is swarms have ZERO use against inanity and only mediocre use against vehicles.

Swarms are slow enough that if a vehicle is already moving there is a fair chance it can out run the missiles, or at least go around a corner making them run into the wall/hill. Their highly visible so everyone, vehicle included knows where they came from on the first shot. Their range is pretty lame and while it locks on up to 175m away, just about everything but small blaster turrets can cut a swarm launcher down in 2 seconds flat at that range. Never mind you tend to have to fight at 100m or less if you want to actually get the 3-4 shots off it takes to kill anyone.

I never understood peoples grief with swarms. The only way your going to die to a swarm launcher is if your completely stupid and sit there, or already under fire from a lot of other sources of AV and the swarm just happens to get the last shot. Frankly other than DS it's perhaps the worst form of AV there is. It's only moderately good if you take it to full prof and put it on a maxed out mim commando skill suit. More tanks die to PLC and Av grenade combos any day.

So to me the swarm launcher is already a highly specialized AV weapon. It can't do anything to infantry and it's only moderately useful against shields due to it's RoF and dmg penalty. You won't even see most hardened shield tanks HP bar even move when you hit them with swarms. If you make it even less useful against vehicles there will be truly no reason to use it at all. Not unless your willing to bring back the dumb fire mode so it could shoot infantry like every other AV weapon (other than grenades).