Before I switched to mostly using Kobo's Webkit/Readium based renderer, I used to use the Disable orphans/widows avoidance patch and then switched (2020???) to using:
Code:
[Reading]
readingAdobeOrphans=1
readingAdobeWidows=1
However, I still use widows/orphans=1 in my CSS since I vaguely remember the patch was to RMSDK and the Reading section also only affected RMSDK.