From the Official Site :
PgcEdit is a DVD IFO and Menu editor designed to allow the modification of the navigation commands and parameters of an already authored DVD structure.
PgcEdit is also an excellent tool to learn how a DVD works, with his powerful Trace function.
Since v0.6.0, PgcEdit is also the first program able to burn a Double Layer DVD-Video on DL DVD+R or DL DVD-R, with an interactive interface (including a preview), to select the position of the layer break.
The official change log for version 8.2.1 is as follows:
- Fixed bug: Trace mode was broken when called from the Trace menu.
You may download this updated version here