What I think would be really useful is an advanced render script, presenting a GUI screen like the D3D one, but that allowed adjustment of the envsphere intensity, intensity of each light and maybe also the diffuse (adjusting this globally across all materials).

I guess at launch it could parse all the diffuse values and present some data, like max, min, mean etc of diffuse values... that sort of thing.

Maybe as well as the diffuse, speculars and sss scale?

Just thinking out loud...

...but I'm sure there is probably some way this could be figured into a pre-render adjustment / render settings script... if someone had the inclination to do so...

...possibly with some of the "balancing" equations (ideal diffuse relative to lighting, relative to IDL intensity, etc) figured into it as heuristics / suggested optimum values?