Considering (I'm pretty sure) there's already laws against armaments in space, it's pretty clear treaties like that were dropped a long time ago, simply because they're this obtainable. If we pretended to be the Earthers at any point that's also breaking the rules of war... technically, as mercenaries, we are considered illegal combatants under the geneva convention. We're not even PMCs, which are more legal. So modern laws aren't really a good basis. It's illegal for any of us to fight. At all.
I can't. All I can get is an overpressurized cockpit.
Can I recommend non-friendly fire options for those who don't have them?
Seriously though. Good to have non WMD weapons for when we don't want to inflict collateral damage. Not that NBC sealing isn't great and I wouldn't get it if I could, but...the overpressurized cockpit is only like BC sealing. And not even all that great BC sealing, at that.
Well, I have a laser. But that's no fun. I've got a MMM mech, not a pew-pew mech.
The mid-air abortion thing is good for avoiding collateral damage. The non-Sarin filled rounds will mean I won't have (as much of) a compulsion to see just how much damage a Kinetic Impact Round does to a Small sized mech.
Once again, I'm not too concerned. If you're being gassed by Sarin, the odourless, colourless gas, you'll be somewhat less than dangerous. Not to mention you'd have to step where I was shooting, then turn and shoot me before you either faced incapacitation or I shot you.