Currently, when using VRCFallback with toonstandard, the fallback shader may appear flat if the original shader doesn't define a _Ramp property, as no ramp texture is assigned by default.
It would be helpful to support specifying the shading mode directly in the fallback tag, such as toonstandard_realistic or toonstandard_realisticsoft. This would allow the appropriate built-in ramp to be applied automatically, improving visual consistency in fallback scenarios.