It's interesting to note that other developers are having difficulties with integrating SLI support into their sims. ROF for example are experiencing difficulties as when they increase SLI performance, single card users are disadvantaged.
http://riseofflight.com/Forum/viewto...p?f=45&t=18901
Like a lot of things, you make a change here and it has detrimental repercussions elsewhere.
Cheers!