Merchants and alt coins

[zumbador]

I am a merchant that currently accepts bitcoin, litecoin and ppcoin, I process bitcoin payment via Bitpay. All other coins I process manually after agreeing on an exchange rate with the customer, after which there Is a time limit to initiate transfer of the coin. (usually 15 minutes) How are some of you other merchants dealing with this? I have been after bitpay to add additional coins without much success.