At the risk of annoying the providers of this program (since I know other people have suggested it), I wanted to put in another vote for enabling multi-sessions. Yes, most of the time they are not necessary, but sometimes they are necessary. For example, a company that I work for wants to write our disks in a WORM-complient way (write-once-read-many) for various compliance reasons, and can't erase and rewrite the backup disks for this reason. We have incremental database backups that we want to write each day, so a multi-session disc is the only way to go, aside from having a new disc for each day.
I was implementing command-line burning at the office and almost used ImgBurn until I realized that it didn't have this feature. So now we're going to use Nero .
Anyway, you don't have to implement it if you don't want to, I just think the program would be more popular if you did.
Thanks for all your work!