Thanks for this very useful work!
From an end-user perspective which, I guess, fits the Ocaml Platform goals (in particular for newcomers, as I teach OCaml to postgraduates), it would really be nice if the step of manually creating an empty .ocamlformat file could be get rid of, one way or another.
More generally, I’m linking to some suggestions I had made based on my teaching experience here and there. Hope they’ll be considered and possibly addressed (and if not, it would be great to give a the rationale, to keep track of the answers).