provide more information. remember that i'm not watching your computer.
1. how much do you set as total speed
2. how much for single address
3. what you see that makes you think it doesn't work
i just tested and it works to me.
i set 400 as total, and 300 for single address.
then, i downloaded from 2 different addresses. the first is going at 300, the second at 100.
as i remove the "400 total", they reach both 300. just as expected.