the foundation's "secret sauce", i.e. the configuration files that are not made public, if such thing exists. Then would come the whole traffic balancing/caching/optimization settings, which would greatly depend on the actual traffic a fork would have.
Strainu
If you control your own servers, vital for a fully functioning fork, you'll eventually work out the technical details.
However, I'm afraid the "secret sauce" involves interpersonal elements, including respecting the sensitivities of others on a global basis.
Fred