FileReference.upload tinkering

I was wondering if anyone knows how to change the names of the elements sent in the POST method for FileReference.upload().

Currently it sends…
[LIST]
[]A Content-Type element of multipart/form-data
[
]A Content-Disposition element with a name attribute set to “[COLOR=black]Filedata[/COLOR]” and a filename attribute set to the name of the original file
[*]The binary contents of the file[/LIST]I would like to at least change the names of the attributes to fit the framework I have set up already. So basically change “Filedata” to be “upload_data” … is this possible?