I tested the Visual Editor and found problems inputting while using MS Office IME 2010 (Windows 7, Internet Explorer). Acts as if it randomly accepts an "enter" key input, even whenI have not yet pressed "enter", having only manipulated arrow keys and space bar.
This either results in rendering unconverted pure-hiragana text ("ありがとう" instead of "有難う") or at other times when I try to convert the entire "ありがとう" it gets split the word up and starts converting just the "あり" part.
I think Visual Editor would be great for new users who find it overtaxing to use markup. But currently, the input is too glitchy so I can only recommend that Japanese-speakers create a draft using their own favorite editor and copy&paste the texts, footnotes, etc. --~~~~