Regarding the
Primary Dictionary option, I just had a look at the K4 manuals and according to manual there's a
Dictionaries option that lets you choose the primary dictionary.
Kindle 4
Quote:
To go to the Settings page, select Settings from the Home screen menu. Use the Next page ► and Previous Page ◄ buttons to view all the options. The available settings are:
[...]
Dictionaries: Lets you choose which of the installed dictionaries to use for word lookups.
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Kindle 4 Touch
Quote:
To go to the Settings page, tap the Menu button from the Home screen, then tap Settings from the displayed menu. The available settings are:
[...]
Dictionaries: Lets you select the default dictionary.
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Out of curiosity, are the manuals incorrect, are these options only available on registered K4s or do they exist but don't work?