2) there are 2 package called renameotabin and binaryrenamer, you could use either, the latter also blocks all types of logging from what i could tell. they both achieve the same functionality of blocking updates from amazon, meaning you can safely turn on wifi on the kindle, although putting a update file manually in kindle's visible storage and restarting still updates it, so keep an eye out for any stray bin files
3) you could achieve it via koreader's inbuild calibre plugin, just set up your calibre library to be accessible over the local network or something and that should be it.
6) install KOL->
https://github.com/yparitcher/KUAL_Booklet