Another project update:
Although not explicitly stated on the FAQ or Tutorial pages yet, some other programs like DBPoweramp are accepted as ripping programs if you use those. We have found that gap data is actually something that at least most CD ripper programs will process correctly. If you are using another program and aren't sure if it should be accepted, feel free to contact us.
Basically, if the rip is in any lossless format and if there is CD text present and unaltered (which the majority of albums don't actually seem to have, mostly just later Carlin albums), and scans of all media is provided, then it will probably be accepted.