[GeoffR]

Originally Posted by geek1011

You can put it in the GitHub repo (or I can) when you think it's ready, then I'll do a release.

I've added this patch on GitHub, it is exactly the same as the one I posted here but I've added a description and given it a less cryptic name:

Reduce top/bottom page spacer: (nickel.yaml)

Spoiler:

Reduce top/bottom page spacer:
  - Enabled: no
  - Description: |
      Reduces the blank space that remains at the top / bottom of the page when
      the "Show title" / "Show footer" reading settings options are unticked.
      Spacer height is halved, customise by changing the min-height + max-height
      values in the Replace: lines below. Affects both ePub and KePub books.
  - FindZlib: "* {\n  background-color: white;\n}\nQWidget[smallIconHeight=true][qApp_deviceIsTrilogy=true]"
  - ReplaceZlib:
      Offset: 0  # Touch/Mini: 24px --> 12px
      Find: "MediumVertSpacer[qApp_deviceIsTrilogy=true] {\n  min-height: 24px;\n  max-height: 24px;\n}"
      Replace: "MediumVertSpacer[qApp_deviceIsTrilogy=true] {\n  min-height: 12px;\n  max-height: 12px;\n}"
  - ReplaceZlib:
      Offset: 0  # Glo/Aura/Aura2ed: 32px --> 16px
      Find: "MediumVertSpacer[qApp_deviceIsPhoenix=true] {\n  min-height: 32px;\n  max-height: 32px;\n}"
      Replace: "MediumVertSpacer[qApp_deviceIsPhoenix=true] {\n  min-height: 16px;\n  max-height: 16px;\n}"
  - ReplaceZlib:
      Offset: 0  # AuraHD/H2O/GloHD/ClaraHD: 44px --> 22px
      Find: "MediumVertSpacer[qApp_deviceIsDragon=true] {\n  min-height: 44px;\n  max-height: 44px;\n}"
      Replace: "MediumVertSpacer[qApp_deviceIsDragon=true] {\n  min-height: 22px;\n  max-height: 22px;\n}"
  - ReplaceZlib:
      Offset: 0  # AuraOne/Forma: 56px --> 28px
      Find: "MediumVertSpacer[qApp_deviceIsDaylight=true] {\n  min-height: 56px;\n  max-height: 56px;\n}"
      Replace: "MediumVertSpacer[qApp_deviceIsDaylight=true] {\n  min-height: 28px;\n  max-height: 28px;\n}"