I think if I understand the original request right, that this is exactly what I've been trying to find out if it was possible to do...
As it is right now, we have a global setting for the maximum transfers at the same time. It defaults to 8, which for me as well has been perfectly fine. Until recently, when I gained a new client who's server does NOT like 8 connections at once.
Therefore I'd like to ask for two featurss:
1) The ability to set # of transfers on a per site basis, which if not set defaults to the global. This is I believe what the original poster was requesting.
2) When a server complains of two many connections, the dialog that pops up should have two additional option buttons:
A) Pause All Transfers
B) Cancel All Transfers
Otherwise it just get's stuck in a loop that you can't get out of unless you're quick enough to suspend or cancel all transfers using the right-mouse button menus.