I've never bothered with actual patches (config file entries don't count). I had KoReader for PDFs for a while till Kobo added margin cropping (now per document). KOReader is a pain for 1000s of ebooks as there is only slow search or slow file browser, no metadata library interface. I fix any broken CSS in Calibre Editor so don't need the mad nested menus of KOReader over-rides.
I don't use kepub and I think some of the patches improve it.
I only organise by Calibre. Have about 8,000 ebooks (about 90% PD) on the Kobo Sage. My proofreader uses a Kobo Libra 2.
I don't see the point of dark mode.
Even the 8″, never mind a colour 7″ is too small for most PDFs except small format instruction booklets.
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