Firstly, thanks for your support and we are glad you enjoy the game!
To answer your question directly, no. We cannot change to that level since that is at the engine interface level. You experience these wonderful graces of new technology in Portal and SC2? because they are running a newer version of Valve's Source Engine (2009 to be exact).
Philosophic question: Why do you care about SLI and multi-core rendering if you are already getting 200+ fps?
You are maxed out by the source engine to 100 out frames, that has nothing to do with your SLI capability. What this means is you are sending 100 updates of your network state to the server per second. Which server are you connected to that gives you "hundreds" of updates in?? Most are bound to 33 or 66.