When using PL for a Hyatt stay....

1. The stay does not qualify for FFN, thus no need to use MasterCard.
Correct

2. Incidental charges are eligible for GP points, but I should retain my folio for proof.
Correct, add your GP # at check in

3. The stay does not generate 5 GP Points/$ nor bonus points (aside from incidentals).
Correct

4. Those with Diamond status should not expect Amenity points or upgrades.
Incorrect, diamond benefits apply on all stays.

And, a few additional questions...

5. Can I earn G1-G3 bonus points with a priceline stay?
No

6. Do priceline stays count toward earning status?
No

7. What is a "stay credit" ?
Qualifying stay (for status, promos etc)

8. Other ways to maximize benfits from PL stays?[/QUOTE]
Bid low.