Is there any way to adjust the brightness/contrast of the LCD module from code?
Absolutely. It's in the API
(sorry, phpBB hates the exclamation point, so no clicky links)
in com.buglabs.bug.module.lcd.pub.ILCDModuleControl, there is a method setBacklight(int intensity), which takes a value between 0 and 3 to control the backlight intensity.
The code would look something like this (assuming you've gone through the BUG App wizard and chosen com.buglabs.bug.module.lcd.pub.ILCDModuleControl as a service in your app):