personally I do not see the reason to re-tag -- its the meta data thats important. Its the tag value for the album like DTC said that will split them, not the file naming convention.
I also like to keep the disk numbers and the original tracks. I set the track field to not to write to the disk.
My ripping mask will split the cd like so Album Name\CD#\tracks+image file as folder.jpg which allows me to keep the cd rip=to the web tag information, and also I don't have multiple root directories for the same album. (not to bad for 2cd recordings, but for box sets its a mess. Most of te time I will order the tracks (say a double cd with 20 tracks on one and 17 on the other) from 1-37. However if need be the original disk rip cand be re-imported or burned. The library will keep track of the metadata, without overwriting the ripped metadata.
basically to keep Albums from splitting the Album Name and the Album Artist (or Album Artist (auto) )tag fields must be the same. Why Various Artists (or the equivalent) is used for compilations, leaving the artist field for by-track information.