Just to extend what these guys are saying, you don't want to let your CD mastering software insert gaps between tracks for you. This comprimises the ingegrity of the DTS bitstream and will have various negative results dependent upon the DTS decoder.
To retain the integrity of the DTS bitstream, you cannot have any gaps between tracks. If you want to have a second or two of silence between tracks, then these must be edited into the master audio files before conversion to DTS.
Setting up the track markers for a DTS file can be a bit of a challenge since viewing the DTS file in an editor is not helpful at all. What I do (thanks Tab) is take a pre-DTS master file into the track editor and use it to set the track markings. I save the project and then move the pre-DTS master file to another location and re-open the project. The project cannot find the file you just used and prompts you to locate it. At this point you simply direct the project to the DTS file which it then imports and retains the track markings from the previous file.
The software I use to do this is Sonic Foundry's CD Architect.