Take a look at what Falcon from Gamesurge has to say:
Ask Valve! Gamesurge is hosting another Q+A with Valve software, but this time *you* can ask the questions! Have any Server Ops problems? Netcode issues? TFC Questions? Send them all in! We will be collating all the questions until the end of this week, and selecting the most relevant/useful ones to be answered by Valve. Head over to http://www.gamesurge.com/features/valveqa.shtml for more info.