Control over connection used in HttpWebRequest

Is it possible to have any sort of control over the connection used for a HttpWebRequest? I use the BindIPEndPointDelegate property to set the IP to bind the request to. However I want to have 5 keep-alive c开发者_如何学Goonnections that get round-robined through that all use different IPs.

Or is there some sort of way I could contextualize/compartmentalize the connections so that I can say "use this keep-alive connection" specifically?

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It looks like setting the ConnectionGroupName property on the HttpWebRequests pools the connections keyed on that string.