@elliot, I would be a major proponent of this. CF does this quite splendidly (I do a lot of multisite work), but (as a long-time ACF licensee) I’ve been thinking of switching back due to the impressive emphasis being put on PHP-friendliness, and especially, ACF Blocks (which is super exciting!!).
There are so many great frameworks out there, all with pros and cons, but with all of the multisite work that I do, the Network Admin (sub-)menu options page is something I need. I could run two frameworks, but I prefer to reduce overhead when possible (or do it manually, but ACF and other frameworks are just nicer for such things).
Cheers, great work and thank you all!
Daniel