This is a really good post. Some good ideas and some not so good but all in all it seems like you put a lot of thought into this and thats good.
My suggestion is if you're a hunter and someone invades, if you go invisible the invader should not be able to see you. The invader has too much of an advantage sometimes.
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Regarding Hunters, totally onboard with you there when it comes to invisibility. Actually, I'd be okay with getting rid of the invader advantages altogether - no seeing enemies, no seeing mote counts, just pure, use your eyes and kill what you can.