You can import MP3 files into the game,
and
you can assign different crowd chants to different clubs.
It is not confirmed that these mp3s are music files or that they can be used in menus as some are suggesting.
The edit mode has a few additional editable features such as calf & thigh measurements etc There is no boot, ball or sponsor editor (i.e custom boots etc). With regards to the default balls and boots available i haven't been told specifically, but there are a lot.

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