Allow a user to delete/update a submitted form

In case the number of submission a user may send is limited to 1 submission ever
I think it will be useful to let the user delete/update his form.

In that case when the user will access the from in the second time
the form will be filled with his previous submitted data and the button update will be presented at the bottom.

I think it might extend significantly the possible usage of this fantastic module.

Thanks