Debug Mode (not GPxPatch)

Does anyone know how to run GP4 in Debug mode? I don't mean GPxPatch's debug mode, I mean the one referred to in f1graphics.cfg:

800 ; [DEBUG] Game 3D Horizontal Resolution
600 ; [DEBUG] Game 3D Vertical Resolution
1 ; [DEBUG] Enable 32bit mode if available NB. If Windowed then is forced to desktop format
1 ; [DEBUG] Enable hardware T&L if available
1 ; [DEBUG] Run in a window
0 ; [DEBUG] Number of multisamples if available (0-16 :: 0 => off, 1 unused)
0 ; [DEBUG] Force use of reference rasterizer
0 ; [DEBUG] Vsync (0=>off, or every nth frame) v2
153 ; [DEBUG] AutoPerformance (Automatic Performance Setting)
0 ; [DEBUG] TestedPerformanceLow (Tested Performance Setting)
0 ; [DEBUG] TestedPerformanceHigh (Tested Performance Setting)

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Intel NUC 8i3, 8GB RAM, MS Sidewinder Wheel