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I found in /usr/bin/dump-stack that you can drop and empty file called DISABLE_CORE_DUMP in the main visible root (/mnt/us/) to stop Kindle from making core dumps (KPPMain, powerd, cmd, and possible others).
As far as I understood, this JB method requires this specific file in in the system root (/PRE_GM_DEBUGGING_FEATURES_ENABLED__REMOVE_AT_GMC) to be present in order for JB to work. This, in turn, makes Kindle a dev test device. Therefore, stack is dumped upon several actions, most of them are actually regular actions.
I tried it on Kindle Scribe, both on FW 5.16.2.0.1 and 5.16.21 (hardfloats, hf), and it worked both times. No more core dumps.
Only occasional things I still get is from Indexer, it dumps some archive and summary of what was indexed in /mnt/us/documents. But at least these are a few hundred KBs, and not 200-300 MB that core dumps were used to be. Most of the times it is when I exit KOReader that was launched in "no framework" mode.
This method is the least intrusive, and it doesn't seem to break anything big time. I can still browse Kindle store, read books, etc.
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