Make sure you're using Windows 10, version 2004 (build 19041) or Windows 11.
It's possible to disable yellow border but only on Windows 11. If you are using Windows 11 and still seeing the border, open Windows Settings app and search for "screenshot borders". Make sure all the options and ShaderGlass are allowed to remove the border per below:
OBS can capture ShaderGlass but only as a Game Capture source (not Window Capture). Use "Capture specific window" within Game Capture to select ShaderGlass window only.
Yes, you can save shader profiles and even load them on startup via a command line parameter. See README for details.
Please read through README to find functionality you are looking for.