directonal option for doublesided lights

[themaxxer]

hi all

would be great if you could add an additional option for another directional parameter for double sided lights. so you could set 0.3 for the down parameter and 0.7 for the up parameter...
http://c2n.me/3JhzAqO.png

only for clarification how does vray handle the directional parameter for a double sided light? is it also used for the other side? or is it only used for the arrow direction?

thanks
themaxxer