[Roy Dennis]

It uses the Artist, Title fields so you don't have to define a field order, I'm not sure about Genre & Disc Id, most of mine show a XYZ0xxx for disc id and the genre will be limited to the types allowed in Hoster at the moment.
It does import in disc ID of 99 tracks per disc Id.
Example: if you make as I suggested in earlier post your first Book Id before adding folder 30000 it will import as 3000001 to 3000099 then will automatically go to 30001 which will make the next book id 3000101 to 3000199 and so on.
The 30000 I suggested is just how I do mine, I at the moment am only up to 417 for my book id ie 41701 to 41718 was my last karaoke Book ID, so that I can carry on using 5 digit # in my printed books for karaoke that will give me some years grace, I chose to import my videos starting at 20000 and my audio only at 30000.
It's just a way of keeping them separated and as I don't print audio and video books for the punters the large numbers aren't a problem, you may think different.

I think the best thing for you is to try it with a small amount of imports first to see what suits you rather than go and import them all. Just make a folder up with about 200 files in and import that first to get a better understanding how it will handle the book ids.