I use this trick all the time as it saves you from switching between modes.

Some other useful keyboard shortcuts when in Japanese input mode:

To change text to katakana: press option + x
To change text to romaji: press option + s
To change text to full-width romaji: press option + c
To change text to half-width katakana: press option + a

NOTE:
This can only be done while the text is still underlined, that is, before you hit spacebar or enter to get the word suggestion. They also require the specified mode to be available in the kotoeri input menu I think.

option + s is especially useful when you're still in Japanese mode and entered something that needs to be in romaji (like a URL)




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One more reason why the Mac IME blows Windows' out of the water. Your comment is GREAT, and I think this shortcut should also be put into the hint.

Absolutely superbly helpful. Thanks!

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