A ROM verifier/manager is an absolute must, MAME32's internal audit feature is pathetically inadequte for any proper user.
ROM center (
http://www.romcenter.com) is my poison, piss easy to use and has a nice interface that shows you everything you need to know with hardley any hassle.
It'll generate a data file from any MAME executable, althougth they sometimes need a bit of manual adjustment. Havent tried 0.64 yet, but the generator kept listing the SKNS bios files as being part of the individual game sets in 0.62 and 063.