Options for editing mpeg video other than MPEG_Streamclip?
MPEG-2 is subject to license restrictions and royalty payments, so you won't find much in the line of free software to edit MPEG-2 videos.

You can do this sort of editing in QuickTime player with QuickTime Pro, but be aware that MPEG-2 for DVDs uses a complicated compression scheme using key frames and "difference" frames that repeat in a regular pattern (Group of Pictures a.k.a GOP).  You cannot just edit out one frame without re-encoding the rest if you want to play it in a DVD player.