Use additional slot(s) if speed is lower than X

I use 2 upload slots and sometimes they get used up by people downloading at less than 5kb/s with huge queues. Limiting the maximum amount of queued items per user doesn't seem to help with this issue because they will just keep adding to their queue when an item completes and be placed in front of other users trying to download. If I could set my maximum bandwidth and have soulseek open and close slots as they are needed that would be great as opposed to having a slot AND bandwidth limit.