> I've just decided to use GoodGen, and some manual renaming/deleting on my own.
> Just one more question, those games with faulty checksum routines, and bad
> checksums, is it possiable to fix them so they are 'correct'?

Sure, just correct the checksum and then patch the ROM code to either bypass the check or do a proper checksum. It'd be quite a lot of effort with zero benefit, but it's possible.