The hardware would support it, it's just a media changer after all. Windows itself (XP anyway) supports it with a Microsoft driver. The software that comes with it from Sony, however, is only designed to work within Media Center 2005 (vista version coming any day now). But there are a couple of utilities that allow controlling the changer independently of the MCE software.
Right now ImgBurn just sees it as one drive. I use MCE or the utilities to manually control which disc is loaded.
I'd imagine that ImgBurn would have to do something like be able to start recording from a given slot number (0 through 199) and then have options on what to do about skipping to the next disc. As in, skip ahead only once, or keeping skipping until returning to the current slot, looking for blank media each time.
It might be interesting to have an option to require the blank media to be "the same" as whatever the starting disc happened to be. That way the math calculating space needed wouldn't have to deal with skipping between CD, DVD and DVD+DL capacities. If you start with +DL then the subsequent ones have to be the same, or likewise for DVD and CD media. It's be nice to have it be able to automagically deal with recalculating but I could live without it. I can only imagine the hassles of starting with a DVD+DL, then coming across a CD-R and then a DVD+R. Oh, and toss in DVD+RW and DVD-RAM too. Heh, I suppose there's also sorts of complicated options that users might want.
But a basic way to tell it to march through the discs would be a fantastic starting point.
I'd be willing to kick in a few bucks to a paypal fund if it meant buying one for development. I picked up one cheap off eBay but Amazon also had some for $200.