AFAIK it burns the track as is.I don't use it for ripping as, well, its just not very good. Freeware exists such as AudioGrabber.
If it does add seconds on to the start of the track (or finish) then the easiest thing is to use an audio editor such as Audacity (again, freeware) to trim the silence off the tracks. This is how I do it, and at the same time you can "normalise" all tracks so that one isn't overly loud compared to the others.
Cheers,
Jerry