Hello there,
I often set the upload limit to 400 and it is quite common that average upload speed (shown at the status bar) is a little bigger than that. Well, maybe aMule is polite and doesn't want to reconnect in the middle of upload chunk ;-) However today I was curious why my HDD is spinning like mad and it appeared that average upload speed was about 800-900!
Maybe I am not aware of something, but for now, it is a bug for me.
have a nice day, bye