One of my leading complaints with the GH2 is the exposure dial wheel's tendancy to switch modes while attempting to adjust the setting that the wheel is presently in. In my case, most often this means I wind up adjusting the f-stops when I want to adjust the exposure compensation.
Today (after using the camera for a year!) I stumbled across a setting that fixes this. Deep in the Custom Settings menu is the option to change the LVF/LCD switch fuction from changing the view mode (it becomes automatic, which, in my case, it is anyway) to changing the mode of the dial wheel. Once set, the dial wheel will not switch functions by depressing it. You use the LVF/LCD switch to change functions.
Having just discovered it, I can't really say yet if this is an improvement. It does stop the accidental switching but I may find that this is less convenient when I'm actually shooting pictures.
This is just another example of all the little features and nuances that this camera has. It takes time to become comfortable with a GH2 and a year in, I'm still learning. Now, if I could just figure out how to lock all the buttons on the back so that I don't keep hitting them with my thumb...