I don't think that any other tool can do it yet, so I'm glad to anonce that: starting with v 2.6 DvdReMake Pro can be used to merge 2 full dvds. Procedure is completely automated, you simply import disks you would like to merge, go to "Tools\Merge DVD..." menu and select projects to be merged. As a result you will get a new project with a start up menu asking what disk you would like to go to. After that selected disk will play as if it is the only one on the DVD. At any time during playback pushing "title menu" on the remote will take you to this start up menu. It may be not a prettiest menu you've ever seen so feel free to author your own and replace the default one inserted by DvdReMake Pro. Just keep menu button commands. Hope some people will find this feature usefull.