I am aware, that's why I laughed my ass off when I first got Google's Japanese IME and realized that it actually does correctly spell the name of Fuwa Fuwa Time despite the highly irregular reading. In fact Google's IME correctly spells most widely known song titles, fictional work titles, or fictional character names, with an irregular reading. Mozc still does it with a few, like correctly converting inisyarudhi- into ｢頭文字Ｄ｣, but it's a lot more limited with Mozc.