WINE simulates drives that is created in ~/.wine/dosdevices, so you have to think as a Windows user when running WINE. In ~/.wine/dosdevices you can add a symbolic link to /home/aarond/shared. For example, go into ~/.wine/dosdevices and type ln -s ../../shared e::. Then in the program, specify drive E:. All the files will be saved in that location. WINE has the same limitation as Windows on how many drives you can have, but WINE has support for symbolic links to access other devices.
There are P2P file sharing programs in Linux that can access multiple P2P servers all at once. Which one is best is up to you.