I think a nice addition to the My Proposals page would be some type of status (i.e., no. of applications/interviews/hires).
Since a potential employer is not required to communicate with any bidders, I think it would also be helpful for us to know jobs are closed because they have already hired someone.
As i know, if job is closed, your proposal will be moved in archived proposals and you will get email notification.
About other suggestions ... sure, why not. Couple additional information on that page will be very good improvement.