seeed tft touch shield v1.0 backlight?

is it possible to adjust brightness on this shield? cant find any info on their site on how to do it. im not worried if i have to cut a trace or 2 to get it to work i just would like to be able to time out the display back light after a few min.

I don't know of any software solution to dimming or otherwise controlling the backlight. I also don't know if the backlight is accessible to allow control via an external FET or BJT.
The Eagle files available at the Seeed Wiki site may give you that info, or you can try to get a 'response' from Seeed on their forum.