I am desperately looking for an application based throttling, too. For example, everytime I send out an email with some attachements, it's almost impossible to use the net in a productive way. Mail is hogging up all the upstream bandwith, and therefore the regular communication with all the other (web-)servers is no longer possible. Surfing becomes a pain, let alone working... By limiting Mail to e.g. 80% of the upstream limit, everthing was perfect. I just don't care if sending out a mail takes 4 or 5 minutes, but I *do* care if I can continue using my machine!
I think that Little Snitch could handle that (relatively) easily, so I decided to ask for it. I was just about to make a feature request on my own, but naturally, I was not the first to express that idea. So... BUMP!
P.S.: There is another thread regarding that particular feature
, just to show that "we" are not alone