Yes there are a couple of ways.
After you select a source there will be a drop down box "Chapters". If you click on that you can also choose "Seconds" or "Frames".
If Chapters won't work for you maybe Seconds will. You would have to play the movie in your video player. Pause where you want to start and make note of the time. Then play or fast forward to where you want to stop and pause and make note
of time again. You would have to then convert those times in to seconds and enter them into VidCoder.