I've got munich malt punched into beersmith with an SRM of 18.7. Style guidelines are 18.0-35.0 SRM so I'm not concerned about the color.Why bother to keep it a SMaSH if you want it brown ? The point of SMASH is to get an appreciation of what a single Hop tastes like and what a Single Malt tastes like without other malts and hops confusing you. At least thats what I took away from the idea. If you want brown, brew brown. If you want SMaSH, choose a Malt and Hop you want to get to know better and don't worry about the color.
Yes, you can do a single infusion.Another question ... Can I just do a single infusion with SMaSH? I see a lot of decoction mashing when talking about this technique.