1. You're not going to four firmpoints per hardpoint exchange.
2. I'll speculate that under five tonnes, there's no firmpoint.
3. Anything that requires, or benefits, from open sights aiming should be in the turret, of which you can only convert one firmpoint.
4. In theory, any weapon system that doesn't require energy to propel it's payload, like missiles, has no range restrictions.
5. I don't think it's been specified that sandcasters need to be pointed in direction of the incoming laser beam, so you should be able to place it in fixed firmpoints without penalty.
6. Missiles can change direction midflight, so also not an issue.
7. And we've run out of non energy options.
8. I'd stuff four light quarter tonne autocannons into the turret, or one that weighs a tonne or less, though I'm not sure if range really matters, considering their effective ones.
9. Acceleration for commercial spacecraft seems to reach factor five, so any paranoia would likely remain with local jurisdictions.