Your wish is partially granted. Within Settings on the front panel, there is a bright/dim adjustment for both the switches and scribble scripts.
Settings > Config > scroll down to > Appearance. You'll find ring intensity/ring brightness/mini display intensity/mini display brightness.
You can also invert mini display contrast. This also found in FM9-Edit, though someone else will need to provide details. It's in either Set Up, FC Config, or Devices. My guess is FC Config.