how about making a shocker a constant on weapon, as long as you're hitting a target with a freezer weapon, you're lowering their shield by a certain amount for a very short time. That way you at least need another damage dealer to make it effective, and you need to be consistently on target. I feel that your original proposal is too powerful, even at 20/min RoF, it becomes just a question of an entire clan taking out their freezers, trying to hit a ppu, switch to damage gun, drop target.

I feel it should only weaken shields, and leave the full anti-buff with the ppu (or change it to the apu)