A while ago it was mentioned we would have the ability to choose which coins we wanted to mine for scrypt. Is this still in the works or has it fallen to the waysite now that btc is in the spotlight?
I would also like to be able to choose to exclude a coin from the multiport. Don't have any idea how feasible it is, though.
It is impossible the way things are currently architected.
I'd have to create individual multiports for each user. It's a feature I have considered adding in the past, but have not had time to fully investigate what it would take or decide on a design.
In other news, I am reconsidering adding per-coin autoexchange to BTC, and doing it a bit differently than the other pools. Stay tuned.