Thank you for the feedback. Please find attached three separate patches. One to add a new flag to initdb (--no-data-checksums), one to adjust the tests to use this flag as needed, and the final to make the actual switch of the default value (along with tests and docs).
Cheers, Greg
0001-Add-new-initdb-argument-no-data-checksums-to-force-checksums-off.patch
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0002-Allow-tests-to-force-checksums-off-when-calling-init.patch
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0003-Change-initdb-to-default-to-using-data-checksums.patch
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