YafAray - Animate Values

Hi!
I’m testing yafaray because I want to use it in an animation. I have a light that needs to turn on, turn off and increase/decrease its power. I know how to do it in blender (and blender internal), but I don’t know how to animate values in yafaray. I also would like to animate the focal point (distance), but I guess it’s the same problem.

Thank you