HF's are already used a lot. They have great agility -and- they have a torp mount. Just most people automatically go for the VHF as soon as they think fighters. LF's are used a bit too, but only really the Liberator, the Nomad Assassin and Morphling, and perhaps some Kusari ones are deployed in great numbers. Agreed that most others could use a little buff.
Argonaut, SHF's are pretty well useless, as Nighthawk said. Bomber-bait. Size of a gunboat and one SNAC sends them to hell. The only people you'll be killing are idiots, or maybe capships with the right loadout.
As for the general idea: Way too fiddly. Balancing nightmares. More trouble than its worth, and the potential to completely tear apart the community if it's done wrong.