Maybe unlocking the grayed out slide bars is easier than tinkling with locale and keyboard.
Base on this blog (
http://soranoji.air-nifty.com/blog/2...w3131-aab.html ), I tried setting the languages from japanese to middoe english and chinese to old english... well, the slide bars now work for both japanese and chinese, which makes me feel confused.
What on the earth could be the reason for them to disable the sliders for books in japanese and chinese? At least now I've got dozens of funny 'middle and old english books' in my collections.