r.Shadow.Virtual.MarkPixelPagesMipModeLocal

When enabled, this uses a subset of mips to reduce instance duplication in VSMs. Will result in better performance but a harsher falloff on mip transitions. 0 - Disabled: Use all 8 mips 1 - Quality Mode: Use 4 higher res mips (16k, 4k, 1k, 256) 2 - Performance Mode: Use 4 lower res mips (8k, 2k, 512, 128)