Well, I hope this is of use to someone.
It only handles Kickstart 40.68 (both A1200 and A4000D), and 40.63 for the A500/600/2000, and the AmigaOSRomupdate files.
Any probs,gimme a yell.
*edit*
New version with a couple of tools thrown in for free.
RomSplit 0.8