1 - True.
It's one-way right now (accept an invite in Aqua -> it will sync to the server, but not the other way around).
Two-way calendar sync is - still - planned for 1.6.
Not sure what to do with Tasks.
2 - Yes, true.
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1 - Yes, true.
2 - App settings -> composing and sending.
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There is a "BCC to self" settings where you can enter any address, not just your own. Not CC though.
This is per-account setting: long press -> options and folders -> composing and sending.
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Overall, if you're looking for a mail app that very closely implements Exchange specific features -- you'll be happier with an app that is designed with this in mind. Maybe TouchDown, or Moxier.