There are a few settings that are only available manually editing profile.ini file that is located in profile directory under "profiles" in "My Documents"\PiBoSo\GP Bikes\ save path.
under "gfx" section to enable vertical sync.
under "gfx" section to disable track shadows.
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vsync=1
under "gfx" section to enable vertical sync.
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map_shadow_disable = 1
under "gfx" section to disable track shadows.