How to use DVDShrink to burn 2 discs

Hi. Firstly, mods, pls move this thread if deemed necessary. I’m a newbie here.

I would like to ask a question on DVDShrink, which, IMHO, is the best free transcoding software on the web. Now, does anybody know how to use DVDShrink to backup a DVD movie onto 2 discs?(single layer, 4.7GB) since most hollywood DVDs are dual-layer. Any answers will be greatly appreciated. Thanks.