Increasing the number of shader compiler workers

Development Rendering
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1

I have a processor with 4 cores and hyper threading. The editor spawns 4 ShaderCompileWorker.exe processes. How can I increase the number of processes?

I found the following block in the file Engine/Programs/ShaderCompileWorker/Saved/Config/CleanSourceConfigs:

[DevOptions.Shaders]
bAllowCompilingThroughWorkers=True
bAllowAsynchronousShaderCompiling=True
NumUnusedShaderCompilingThreads=3
NumUnusedShaderCompilingThreadsDuringGame=4
MaxShaderJobBatchSize=10
bPromptToRetryFailedShaderCompiles=True
bLogJobCompletionTimes=False
ProcessGameThreadTargetTime=.01
bUseNamedPipes=False
bUseNamedPipesAsync=True
bSingleJobPerNamedPipeProcess=False
bReuseNamedPipeAndProcess=True

Will it work if I decrease NumUnusedShaderCompilingThreads to 0? And how can I save this setting in my user config instead of changing the engine?