I have been using Alt + ` frequently in one of my applications. However, enabling Japanese IME input has messed up this combination because it toggles between alpha and hiragana (Microsoft IME + ...
I use the Anthy IME with ibus. I know that I can switch a word to Katakana with the F7 key but when I do this, any long vowels are kept as two regular syllable katakanas. That is, わあ (waa -- this is ...