A: 1. You can always downgrade if you start your case in a higher category, but if you file your case in the lower category it's not possible to upgrade without refiling.
2. The answer is yes, although I like to do it separately for several reasons, most of all to avoid confusion, but now the government is well aware of these downgrades and I think you could file both of them together as two separate filings.
3. They must be saying something different as that is not true. If your PERM was filed as an EB-2 and I-140 was approved as an EB-3 you can always go back to EB-2 by filing another I-140 under EB-2. More...
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I would like to say a great thank you to Mr. Rajiv's team--Rita, Ursula, Sushila, Pramita, Roopa, and Suman, Mathew. I-140 has approved and waiting for I-485.