Im excited to see where this goes. The current version is quite basic but it has a lot of potential. I think development needs to include:
1) light intensity control
2) lighting on background
3) calculated/rendered shadows
4) more set viewing options, not just from the top. A two finger input would allow pitch control (like google earth)
5) ideally each light would include ws ratings so that you could add lights of differing power and preferably with modifiers that had an indication of loss like -1 stop, etc.
I think the bottom line is that to be more than just a light diagram app, like Strobox, a real rendering engine needs to be included that would accurately show shadows on the set, background lighting, etc.
Johnnedanger about SLR