I Remember than in previous versions of MO3 encoder, there were a nice GUI where you could choose sample-rates for each samples (and choose to not compressing drums-samples, which was good for quality). I downloaded last version of the encoder, and after i get all the files, i just find "lame.exe", "oggenc.exe" and "unmo3.exe".
Don't tell me than now, you can't compress samples individually with different rates. Please, dont tell me that!