screensaver and backlight

You can insert a math channel with a fixed or variable value and use this to drive the backlight on the display. It overrides the value set in the menu system (effectively disabling the ability to change it on screen, therefore set by the software). 

thanks, but i still want to be able to change it without making a separate adjust group for these parameters 

There is a similar idea here: Access screensaver adjustement via internal parameters / Software / IQAN