Ah yes, I already have the Factory Library, it came with Kontakt when I bought Komplete. There is indeed some great stuff there.
Take a look at the top left of the drum kit instrument in Kontakt. Do you see a spanner icon? This is the Edit Mode button. I think...but I'm not sure....that perhaps you can use these options to route different notes through different channels. I have no idea how you do it because I have not delved into that area of Kontakt, but I should think it explains everything on that option screen in the manual.
If the spanner isn't there, I guess that means instrument editing is not available in the free player.
If it is, and you can do the routing here, you would of course have to create the stereo channels in the "output" window (icon at the top of the player). There are tutorials on YouTube that explain how to do that.