Kobo: Turn light on/off according to start parameters 

Kobo only.

Default:
KOBO_LIGHT_OFF_ON_SUSPEND = false
KOBO_LIGHT_ON_START = -1 -- -1 or 0-100. -1 leaves light as it is, other sets light on start/wake up

With this setting Kobo behaves like right now.
if you change KOBO_LIGHT_OFF_ON_SUSPEND to true the light will turned off when the device shows the suspended msg. it does NOT turn the light off when you leave with the home button.
With KOBO_LIGHT_ON_START = 50 the Kobo light goes on every time the device wakes up or Koreader gets started.