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1. I didn'texplicitly do anything against that but trying it seems to result in an illegal invocation error
2. I think so - I'm not sure where to find a reference for other compiler flags in the code though, could you point me to an example I can use to learn from?

const__lwc_component_class_internal=_registerComponent(Test,{tmpl:_tmpl,sel:"lwc-test",apiVersion:9999999});

This is the current result of compiling an LWC component. In order to have a compile-time switch for synthetic element internals, we should add an additional property to the object, which should just reflect a boolean set in the compiler options. Because 99% of components will never set the flag, we can avoid unnecessarily increasing file sizes by only setting the property when the compiler flag istrue (and setting it to1 instead oftrue 📈). Here's where the object is defined:

The flag should be an optional boolean set via@lwc/compiler and piped through the packages to get to where it's needed for compilation. At runtime, you can update the metadata interface definition, then add a helper that you can use in your code.