Tried mixing it with a few things tonight, to see if I could enhance it. Chocolate and Peanut Butter seemed the obvious, so I tried Creme de Cocoa but it was a bust, made it a bit bitter and too much of a bite.
One of the cool things about skrewball is that it's a great sipping whiskey with almost no bite.
Amaretto is another favorite of mine, but it just didn't mix well.
Touch of vanilla had no help. Tried a few different combinations and just went back to sipping the skrewball