As knc1 said, the combined developer keystore is installed on the Kindle as the MKK (bundled with the jailbreak) -- you need it on the Kindle, to run Kindlets (*.azw2), and you need it on your computer, to sign Kindlets (*.azw2).
KindleTool is irrelevant unless you intend to create, modify, or extract update_*.bin installers.
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