I think they not only need more speed, but more acceleration and thrust power too.
Am I the only one who feels the effect of a ship's lateral motion has too much of an effect on not only missiles, but direct fire weapons as well? I suppose this might be realistic, but it's certainly obnoxious, and makes maneuvering while using torpedoes nigh impossible. This is a hidden weakness some people might not consider when thinking about the balance of torpedoes.
I'd only advocate an acceleration/thrust boost if they got a minor speed boost as well. This is only so they can reach top speed in the same amount of time as they do now.
As for inertia: I'm actually fine with it, especially with torpedos. With how devastating they can be, it adds a layer of skill and/or risk with using them. They are technically a high risk/high reward weapon (especially the Reapers), so taking into account your ship's movements relative to your target I think is a balancing measure versus their destructive power. I've missed hitting capital ships at near point-blank range due to being impatient and firing the torpedoes off before I stabilized my ship relative to the target. It's irritatingly frustrating, yes, but at the same time, it my own damn fault. Besides, torpedoes even as they are now are still overall better then the ballistic-mount bomb weapons that WHOLLY RELY on your ship's inertial for their speed.
If you want something to make hitting a target easier, request a targetting lead line that predicts the TRUE travel line of weapons. You can even make it a hull mod if need be:
- ADVANCED TARGETTING SYSTEM - Advanced computers and software algorithms calculate the travel arc of weapons' fire, displaying their predicted path for players. (AI ships receive a small boost to accuracy.)
If you want to make it even more useful, it could take into account your target's current movement as well and provide a "FIRE!" advisory onscreen over the target as well whenever it thinks/knows you'll hit the target if you fire. OP cost would be minimal, I guess, maybe in line with the currently cheapest hull mods.