Use (if you're not already) DC++ available from
http://sourceforge.net/projects/dcplusplus/
It's an open source direct connect client and far superior in almost all ways to the official one. It lets you connect to multiple hubs simultaneously for one thing, and supports multisource downloading (altho it can't really handle anything that doesnt have the same filename in my experience).
The only thing to note is that for some reason hub admins don't like ppl using DC++ (despite them using non official versions of the hub software) so make sure you enter (under personal information) a Description, bcoz if its blank DC++ identifies itself and ur liable to get kicked