There may be Samsung camcorders that have that feature, but I wouldn't get a camcorder based on that since you could easuily do this with any editing software. (Sony Vegas, Adobe Premiere, PowerDirector, etc.)
Just record while start/stopping then later when you import the files place them next to each other or, if the editor has the function, burn them directly to DVD from the time line. You then render one file to any format of your choosing.
But if doing this, (or even if you can find a camcorder that can start/stop but make one file), your video will have one scene, then suddenly jump to the next - but maybe you want that(?) With an editor, you could also space out the files and include breif pauses or add transitions.
If you are using an AVCHD camcorder; with one continuous record (for example one hour without hitting stop), due to the file system limit it makes many files that you later have to join with software into one file. This software is typically included with the camcorder. It will fix the slight skips at the point of the new files.
I suppose you could use that software to join files from the record start/stops, even if not to fix the skips.