After chatting with a couple of friends who recently tried DCS World I found the "Game Flight Mode" and "Game Avionics Mode" to be useless and actually counter productive. Here is why.
These two options are designed to help beginners but because they are off by default and beginners don't even know they exist and what they are for, they end up never being used.
All they end up doing is just clutter the already complex options menu and most notably the controls menu by having two entries for each aircraft (ex: Ka-50 easy and Ka-50 real). All these duplicates make the controls menu somewhat daunting for someone who is new to the sim.
My feeling is that "Game Flight Mode" and "Game Avionics Mode" should be removed as they just discourage beginners more than anything, clutter the menu and aren't used anyway.