Hello! I'm a paying Airfoil user who would really, really like Remote Control via Airfoil Speakers Touch. You said you're planning on doing that in the "longer term", but if you could just add volume control to your 1.1 update, I'd be a happy camper!

You could even restrict it to only global volume changing of all speakers connected to Airfoil as far as I'm concerned ala "linked to system volume mode", if it'd make it easier.