About the faking thing:
If a woman is really climaxing, she'll be too focused on her climax to make a noise with any kind of sense behind it. Screams do happen. Babbles happen. Deep, throaty moans happen too. Chants happen. The less sense it makes, the less likely she's faking.
Good communication heads faking off at the pass.
Keep the lines open and she'll never feel she has to.