Well, obviously, do accept Bitcoin in addition to credit cards, so no customers are lost, only gained.
As this fraction increases, fraud is reduced further and further.
It would be interesting to have a payment platform that evaluates the trustworthiness of a customer right before payment (based on factors such as customer history, shipping address matching the billing address...), and force those deemed "risky" to pay in Bitcoins. It could even handle CC authorization failures: "credit card declined? No problem, pay in Bitcoins instead."
You not going to have a person not defraud you because you provided the option of Bitcoins. If you have transaction that you deem risky, require a bank transfer, that will make it easier for the criminals to go commit fraud somewhere else.
I doubt it. Most fraudsters are trying to convert someone else's credit into cash by buying goods they can sell. If you have a bitcoin, you pretty much already have cash - just use one of the exchanges.
I can't see how.
As a non-fraudster, I would use any available payment method, including bitcoins.
As a fraudster, I would never use bitcoins.