There are several ways to achieve something similar but not exactly like what you want.

When you issue a Jump to another page or to a different activity either through prontoscript or the like, the backlight will come on.

In the home activity script, add the following code. Note that this same code will likely also keep the backlight on 100% of the time even when not docked when on any page of the Home Activity.


var activity = CF.activity();
activity.onSleep() = function()
{
// When screen starts to dim, execute the backlight button via ProntoScript.
try{
CF.widget('PS_BACKLIGHT', 'PS_SYSTEM','PS_SYSTEM').executeActions();
}
catch(e)
{
// ignore any error
}
}