My use wasn't specifically Sega CD like you're doing here, but using that tool in combination with some others was the only way I could build full 1GB GD-ROM images in CDI format years ago. Not sure if that information is helpful at all since you already have a solution to your problem, but it was something I found helpful years ago.
(If you used and of the available tools for building selfboot CDI's at the time, they would always fill the ECC and EDC sections with 00's, so the actual image wouldn't work in a Virtual Drive and you had to burn it and re-rip just for it to be usable in a virtual drive.) It was the only tool I found that could generate the EDC/ECC data, which was very useful for building selfboot images that you could mount in a virtual drive and use without burning them. It could convert between 2048, 2532, 2336 track formats, and would generate the proper EDC and ECC data if you converted from 2048 to one of the larger formats.
I used a freeware tool called ' CD Image Converter' (cic.exe) back during the Dreamcast days. There is actually a program that can do this for you, and much more.
