Dumb question. 

If .8 is supposed to be the correct value for diffuse, why not going forward reset what is currently .8 to be the new one?  IE do a reset.

If you should have GC on.  If you should have diffuse for a typical object set to .8.  Then why not make those the defaults from now on and let people who know what they are  doing change them? Wouldn't that make sense?  

If you need backwards compatibility you can always create a macro or a check box or let poser tweak the incoming material based on which version it was created in.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)