;log mrpi
Actually, that overwrote script used in the default command. Inspired the by complete absence of a working KUAL booklet on the newest devices.
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But several people have written about adding custom searchbar commands, and it is even specifically called out as working in the Wiki documentation:
Kindle_Touch_Hacking#Search_Bar_Shortcuts
Me, I happen to use several custom commands, so I know how it works.
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Protip: when in doubt, restart the framework, it (caching) is usually the answer.