Hey Paul,
there is a new Video about FStorm. It seems as if you can enable a directional Light option to geht more control about the lighting:
https://youtu.be/ytnBkGJp5G0?t=15m56s
You can achieve a similar Effect by adding a Falloff Node to the Distribution slot. Maybe You and Funk have an idea how to add such a functionality to the AreaLight Item:
https://render.otoy.com/forum/viewtopic.php?f=9&t=62903
What do you think?