How do I get upload bandwidth throttling to work?

Hello,

This slider control just doesn't seem to do anything. It seems like my upload bandwidth is either 0% (no downloaders) or 100% (1 or more downloaders). I go to Tools, Options, Uploads, and change it and hit OK. It does not affect any current downloads. I do, however, think it is affecting future downloads, because I left it at 1.43k (when I was playing at getting it to work) by mistake one night and actually saw a really (slow) bad download being attempted the next morning when I got up.

Is this another feature, like the chat, that won't work for now? *sigh*

Regards,
-T