Backlight Flag

[TravisE]

The power bank trick is handy to know; I have one, and it seems to work. Fortunately, the Prime seems to draw enough power to keep the brick from turning itself off (connecting my 50g to save battery power for long-running programs, on the other hand, wasn't enough to make it stay on reliably unless I connected some other sort of additional power load).

I'd like to second the request for a configurable dimming setting, though, as connecting a bank can be inconvenient or clunky. We have TOFF, so having a similar variable for the backlight seems logical. There are some situations in which I personally wouldn't mind trading some battery runtime for setting the display to stay bright for longer periods, or indefinitely.