Is there no way to turn off the automatic backlight during diving?

I really love the descent G1 for its battery life
I've been bragging to all my dive buddies about the battery life and display clarity, and they're all jealous

My main complaint is the automatic backlight (either "Always on" or "At depth"). It's the only thing draining my battery
I really really really don't need the backlight for 99% of my dives

Is there absolutely no way to turn it off? It's very annoying to remember to press the button every time I reach 6m