I would bet that all tuners out there will tune for methonol injection, it not a big deal at all. I know its not a problem for Lund Racing, and im confident they dont charge extra for it either, they dont even charge more for the trans tune, there tunes are pretty much all inclusive, unless you wanna run full E85 with Auxillery fuel.
I live just down the road from Snow Performance, so I went out there and spoke with one of their engineers. Seems like a well though out system, and I might just have to add that to my list.