title_body: What setting for the dropoff rate in a language generator will produce a natural English phoneme distribution?
upvoted_answer: Note that by synthesising vocabulary using a tool like Vulgar Lang, you will not even approximate English even when using the same distributional laws for phonemes. You will get a lot of words that could be English, but are just unused, you get known words but with other meanings, and you don't get morphology or syntax at all.
  
  Of course, "naturalistic ranking" is the best approximation, all other rankings lead to feelable statistical distortions given your conlang an engeneered touch.
  
  As an alternative I suggest looking at the questions and answers under diachronics: Start with real life English and apply systematic changes to the sounds and the grammar. For an example using projection of current trends into the future, you can look at Futurese.