[tshering]

I tried it. The problem is that the password check executable cannot read touch input while koreader has a lock on it. Since I do not speak lua, I cannot solve this.

EDIT: In case somebody wants to play around with this. This is what I did

Spoiler:

I modified \koreader\frontend\device\kobo\device.lua:

function Kobo:resume()
    os.execute("echo 0 > /sys/power/state-extended")
    os.execute("/mnt/onboard/.adds/kbmenu_user/scripts/tests/checkpw.sh")
    if self.powerd then
        if KOBO_LIGHT_ON_START and tonumber(KOBO_LIGHT_ON_START) > -1 then
            self.powerd:setIntensity(math.max(math.min(KOBO_LIGHT_ON_START,100),0))
        elseif self.powerd.fl ~= nil then
            self.powerd.fl:restore()
        end
    end

    Generic.resume(self)
end

checkpw.sh

#!/bin/sh

ksmroot=${ksmroot:-"/adds/kbmenu"}

pwfile="$ksmroot/kbbouncer/bouncerpw.txt"
if [ -e $pwfile ] && [ "$($ksmroot/onstart/checkbouncerinstall.sh)" == "ok" ]; then
  export KBBouncerMode=
  bouncer=$ksmroot/kbbouncer/kbbouncer.sh
  pw=$(cat $pwfile)
  answer=""
  pwcount=0
  while [ "$answer" != "passed" ] && [ $pwcount -lt 3 ]; do
    answer=$($bouncer "$pw")
    let pwcount++
  done
  if [ "$answer" == "failed" ]; then
    $ksmroot/onstart/poweroff.sh
  fi
fi

Be aware that this does NOT work. You will be offered the password check, but you cannot enter the password!