I kinda like that idea. It's possible that an option like that could be quite benificial.

Say for instance, you're looking for a file that you really, really want. Then while you're looking for that one, you happen to run across another file that also looks interesting, but is not as important as the other one. Because you have the "locations" grouped, you may not be exactly sure who you're downloading what from. It's quite possible that both those files might be on the same host. It'd be nice to set a lower priority to the less important file. That way, you wouldn't accidently start downloading the "less important" file and then your more important file would have to be put on hold (because of limited upload slots/per person) until the less important one completes.....

Hope this helps.....