Given that I often type in Japanese or romanized Japanese, my default keyboard layout is the Romaji mode of Apple's Kotoeri input method. But I keep running into an inability to type e.g.
ō without switching (using the mouse) to U.S. Extended.
My search skills both on Google and on this site have yielded no ways of typing the ¯ character anywhere within Kotoeri. Has the entire Internet missed this, or am I just so stupid that everyone's figured it out and it wasn't even complicated enough to warrant how-to articles? Or is it impossible?