Centre spread pages

This AppleScript will set the page color of the doc's the middle spread to RGB 0|255|255. Paste the code into Apple's Script Editor and save it into your scripts folder where you can run it by double clicking or assign a key command to it.

--this is the page color's RGB values edit if you want to change
set pgcolor to [0, 255, 255]
tell application "Adobe InDesign CC 2018"
    tell active document
       
        --check the current page colors and if the center spread color exists set it to master color
        set pgs to every page
        repeat with p in pgs
            if page color of p is pgcolor then
                set page color of p to use master color
            end if
        end repeat
       
        --set the center spread's page color to [0, 255, 255]
        set sprds to every spread
        set c to count of sprds
        if c mod 2 is 1 then
            set cntr to (round c / 2) + 1
            set page color of every page of spread cntr to pgcolor
        else
            display dialog "The active document does not have a center spread"
        end if
    end tell
end tell