Just to add to what Vig said, if you choose "None" that is actually the highest quality transparency value. At least it is when using Xoluil shader. I have no idea why "None" would be better than "best" but it is on my version of Max.
Remap pixel values is only applicable for things like Shading Normal (where you might get negative values in the final image). But yeah, the new colour management is strange. I just set everything to None and then profile to None and left it at that.