When enabled, this tells supported shader compilers to generate symbols based on source filesEnabling this can cause a drastic increase in the number of symbol files, enable only if absolutely necessaryThis setting can be overriden in any Engine.ini under the [ShaderCompiler] section.
Usage
r.Shaders.AllowUniqueSymbols [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.