I also use cFosSpeed and have had great success with it although I rarely upload to huge swarms so I haven't had a real chance to test UDP but I do agree that an option to limit upload including overhead would be beneficial for advanced users.
A small bug I've found. The help file zip "utorrent-help.zip" is being downloaded as an incomplete/corrupted file at 169 Bytes in "%appdata%\utorrent".