Rob, don't feel bad, it took me about 15 minutes of knowing where to look to find it! This uses the buttons in the backbox. Go to the first page of options, and go down to "Color Temp". Hit menu on User and it should give you an RGB value to play with. There's probably an easier way somewhere but that's what I found that worked. Little slow going because I kept hitting the wrong buttons.
Gliebig, the shaker is great! The shaker works on the catapult, trolls, and castle destruct sequence but I don't think on the gate. Not sure. Will have to play more and report back.