Perhaps Dan knew that the final tracks would be in mono format anyway to save space, and recorded the tracks down the center channel. With the exception of a few parts in M2, the entire M1 track, and other bits and pieces, the source files were mainly in in stereo with little stereo effects.
The format of the audio in FS1 was ADPCM WAV, 11,025k, 8 bit. I have 16 bit 44,100K uncompressed rendered WAV's running at 14K/sec, most of it is like that anyway. Some FS2 material is only in 22,050K.
As far as the hiss goes on the tracks, I will perform a light cleanup, and post a comparison track to see if everyone approves. If the hiss cutting takes out too much of the highs, then I just might leave them in thier original form, and it'll be up to others to modify it as they see fit. I just hate to lose a lot of fidelity.