Another option should allow to automatically add the "slow" user to a list with lesser priority when determining where to dl something from.
Besides, there should be a possibility to manually start a downloading from a specific user (or at least try - when he doesn't have any slots open).
Also, if the previous option would be included, maybe an average download speed from each user could be shown next to the nick?
I know it's not easy to put all these options to dc, but maybe other users would like to see them too?
Thanks in advance