Caret, selection, and other editing features should work with vertical text.
Does this bug cover supporting input methods, or should that be a separate one? At least on Snow Leopard, AppKit supports input methods with vertical text.
(In reply to comment #1) > Does this bug cover supporting input methods, or should that be a separate one? At least on Snow Leopard, AppKit supports input methods with vertical text. It can be. But input method might be a big enough chunk that it could be a separate bug. I guess it doesn't really matter though as long as we can agree on one way or another.