yeah, it looks like there is no way to modify those values without making some custom kismet nodes or hard coding. you might be able to paste the matinee into a text editor, modify and re-paste back into UDK if you are super resourceful :D
convert your dominantDirectionalLight a dominantDirectionLightMoveable and hook it up to the "Target" of the Set Actor Location node. Uncheck "set location" in the Set Actor Location node properties. Crude, but tested and works. When the level loads it'll add a value of 100 to a float variable. That variable is then fed…
AH! Gotcha. I was able to get it to work using both a dominantDirectionLightMoveable and a SkyLightToggleable. Make sure the SkyLightToggleable has its physics set to "interpolating". You can find this in it's properties by searching for "phys". Next, make a Matinee and an new lighting group (right click on the left -->…