If I understand how the system works you can write programs for it in C++ to make the LCD display what you want it to. The ingame information would have to be coded in a C++ program linking the info from the game into it. Again not really sure that I have that right but that is what I was able to get from a couple reviews about it, one site that talks about programing the LCD on the keyboard.
http://www.metku.net/index.html sect=view&n=0&path=reviews/logitech_g15/index_eng