Yea, Dire Implosions... keep anything you care about well away
Cover them with Riot shields or something like that, at least.
On the point defense modules, that has occurred to me, yes, but there's not really time for that pre-7.0 so for balancing the Lightning Torpedo Frigate my current plan is:
1) Make the AI pay 1.5x as much for them as it would normally (same multiplier it gets for the Zombard).
2) Halve the torpedo's speed.
3) Triple the torpedo's self-attrition time (so effective 50% increase in its effective range)
4) Reduce torpedo health dramatically so that a disengaged fleet is very likely to shoot them down before they self-detonate. Whether they're shot down far enough away is a function of the range of the ships in question, etc.