XUpload - pass the original files field name

[Buyaphoto]

I using xupload pro 3 and have a form that has multiple file uploads but with different field names.
Example:
<input type="file" name="bird_01">
<input type="file" name="bird_02">
<input type="file" name="cat_01">

I have tried adding field_name to my @file_fields = qw(field_name file_name file_name_orig file_status file_size file_descr file_mime); at line 409 of upload.cgi but it only gives me file_0, file_1, file_2 what I need to get is bird_01, bird_02, cat_01

Any help would be greatly appreciated.
Dean