I wouldn't actually mind a unit like this.  It's easy enough to say that flak can counter LRF, but often times (especially if your Advent or your opponent is Vasari) your capital ship is already dead.  Some sort of interception option would be nice, but I doubt we'll see something like that.

Aren't missiles also a particle effect with the decision regarding impact decided prior to the actual hit? I know that you can phase out before they hit you, but the HP reduction is not synced with the impact, making me wonder when the game calculates it out.

That aside, it's a nice idea and generally employable in games, but I thought that's pretty much what shields were for. I really only see this as useful for phase missiles, but then I also wonder if they're supposedly phased enough to mitigate matter interactions.

That's part of my point though. I'm not sure how you would implement an interceptor. From a modding point of view, it appears difficult if not impossible. From a dev point of view, I'm not sure if the engine was designed for such a thing.

Not totally trashing the idea. With Homeworld or other complex space games, I would see it being possible (technically already done for larger missiles). With the way Sins is built, I dunno.

The devs could put it in but I am sure it would have to be at a core level.  They would have to add parameters for "beam", "projectile", "missile", "flash" and "phase" weapons varaibles (I think that's roughly it).

Then you could make abilities that affected only a type of weapon--which would be Awe-sooooome!!.

I'm pretty sure they don't currently do this.

If there were a way to affect missiles instead of all weapons or just energy weapons, fine.  You can create an ability/buff that decreases the range/rof of energy or all weapons, but can't affect individual weapons.