Quote - Make GC slider simple, and watch me plunk down my cash!!!!!!!

Are you using Poser Pro (either version)? If so, then I can't see how you could get it simpler than it already is.

GC workflow in PPro can be done in a few clicks:

1. In Render Settings, switch on GC (and change the value to your liking... 2.2 is usually good enough for most scenes so most times it's just a case of one click to activate render GC).
2. If you're using any of BB's shaders that don't have automatic GC detection built-in, find the PM:Gamma node and change it to 1.
3. For each control texture/map (i.e., those that aren't colours that will show up in your render: transparency maps, bump maps, and so on) change their custom gamma value to 1. Or use the script that's included in PP2010 to make this step even easier.
4. Render.

It's only step 3 that might be confusing or difficult at first, but it all comes down to knowing what job each texture map does... if it's colour that shows on your model then leave it alone; if it's used to control displacement, transparency, etc, change its custom gamma to 1. Apart from using the new script to help gather up your textures in one place, there's very little you can do to make it any simpler.
After all, the decision about which maps are textures and which are control data is ultimately a choice only the user can be sure of. An automated routine could only make a good guess, and you'd still have to go through each one and check that it guessed correctly (or read your mind correctly).

Or maybe you mean a one-click or one-slider control that would make your renders look good with GC switched on? In that case... I don't think so. The reason someone's renders look washed out or strangely tinted with unwanted colours when they switch from non-linear to linear workflow is a result of their learning techniques that were made to compensate for lack of linear workflow. So naturally, if you bring these practices that tried to compensate for something that's missing into an environment where the feature is now present... yes, it's going to look horrible, wrong, washed out, whatever. There's no one-click, one-slider solution to making someone change their approach to lighting and shaders.

Hmmm... it seems this thread is demonstrating the Renderosity version of Godwin's Law:
"As a Poser forum discussion grows longer, the probability of it drifting into a discussion about gamma correction approaches 1."