How can we raise this feature request with these 2 (as well as other) exchanges?
Presumably you are looking to do this to take advantage of the price difference (arbitrage).
That arbitrage exists because of the difficulty in moving cash into the exchanges.
So once this friction is removed there will not be the price differences.
And thus little need to move your cash from one exchange to another.
If Bitfloor offered account-to-account (A2A) transfer, then at least you could have private individuals willing to sell their USD funds at a premium. For instance, instead of withdrawing to a bank a person might be willing to deliver those funds directly to you in exchange for your consideration elsewhere (e.g., a deposit of cash into that person's bank account.)
That would possibly qualify them as being a money transmitter though, which is insanely expensive to offer due to compliance requirements. That's why Mt. Gox quick completely offering their redeemable codes.
