Continuing the discussion from Tab key behavior:
I tossed together a package that creates a command for auto-indenting the current line. It’s called Emacs Flow. I used the following in my keymap to map it to the TAB key to make it behave more like Emacs:
'.editor:not(.mini)': 'tab': 'emacs-flow:auto-indent'
I expect to add a couple more Emacs-like features tied to indentation and wrapping to the package over time.