i think the point is Harm he wants to resume failed files, although ioB allows you to keep the broken files, does it allow resume?
as im sure your aware ioftpd will only pass the crc for the current upload, and if this is a resumed file, it will not pass the correct crc for the completed file (only the crc for the resumed part)
ioSFV since 2.0beta1.29 handles this just fine