Finally got around to making a simply/r4 batch rom trimmer. It trims them to the exact same size as the M3 trimmer (tested 10 or 15), and it's faster than M3's to boot; best of all of course, load up as many as you want. It writes the trimmed roms to the same folder that the roms were dragged from, and appends the familiar "_trim" to the filename. It's only 145k. get it here. Let me know if there's any problems.