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roundup does not need to record charset on all occasions. 
if you need that, you can do that with database detectors.

sending mail attachments without charset parameter in
content-type is not a bug.  8-bit characters with 7-bit
transfer encoding was a bug.  it is fixed now.

yes, i think that the best place to store charset is mime
type property.  but if you want to store character set name
separately in your tracker, you are free to do that.

there should be no places in roundup breaking if file type
contains parameters.  if there are such places, they must be
fixed.