Mame Devs removed the ability to save per game config files as regards to shader settings a long time ago and have never seen fit to put the feature back in.
Wankers.
If you want to do it now you need to make the adjustments whilst in game and note them down and create one manually.
..Or make adjustments to the default ini files for the shader your using in the BGFX (assuming your using the BGFX renderer) folder, inside the MAME directory.
Look for the 'Chains' folder and in there you'll find the individual files, such as 'CRT-Geom' open it up with a text editor and change the default values to the ones you copied down whilst in game and save.
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