Fish type mobs won't follow you out of water on live. As of now, though, they've put some mechanics in to prevent safe-spot exploits. DoT's don't do damage if you're not in the water with the mob. LoS check always returns false if you're not in the water with them. And I believe if the mob happens to die while you're out of the water, you'll get no xp.
As for #3, store the air remaining. That's what Live does. I believe that STA is what determines your total amount of air. The formula in place now seems to be okay. May not be right on the dot, but it's close enough that I don't notice any big discrepancy.
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<idleRPG> Rogean ate a plate of discounted, day-old sushi. This terrible calamity has slowed them 0 days, 15:13:51 from level 48.
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