I never seen any custom openGl settings on my NT4 drivers opengl settings page.
I used 6.31, 6.46, 6.67 and 10.80 without results so I decided to do myself !
Here is what I do ...
I used the "SaveAs" button near the custom opengl settings with a name like "DefaultValues6.67".
I opened the regeditor and I searched the name "DefaultValues6.67" usually the key is
under NVIDIA CorporationNVTweakDisplayOpenGLSchemes but depends on the release driver, the key could
be under HKEY_USERS root or HKEY_LOCAL_MACHINE, so let the search function to find it.
After that use the contextual menu "New" and sub item "Binary Value" to add yours values.
You 'll find yours values in the "NvWsApps.cfg" file of your release driver archive.
Open the file with a text editor and see the section "Maya".
So in the register editor name your key "Maya6.67" and double-click on it to edit your binary value.
So you have to type the hex values from your text file. Depends on the release driver you can have
16, 17 or 18 row of hex value to type in.
Once you do that, you can return to your display properties and see on your listbox of custom opengl settings
the name you type for your key (for me "Maya6.67" ). Select it and click on Apply.
I think with that tips you can have any custom opengl settings for any Apps. For me it works
but USE THAT AT YOUR OWN RISK, if it doesn't work post yours problem to let me know and use the default
settings you saved on the first step to recover.