@kettch: Si Senor. The CustomRules.js by default has
// Delay sends by 300ms per KB uploaded.
oSession["request-trickle-delay"] = "300";
// Delay receives by 150ms per KB downloaded.
oSession["response-trickle-delay"] = "150";
So it seems to apply a delay based on the volume of data. That seems reasonable for throttling bandwidth.
Plus this Fiddler Extension http://fiddlerdelayext.codeplex.com/ for latency looks like a winner combination.