Once more Flightgear flying

Looking for a way to make flightgear use the Twinview mode of my old Geforce4 TI 4200 Card, I stumbled upon a wonderful option: --enable-game-mode
now my command line to start flightgear is which gives me about 25fps:

>> fgfs --geometry=2304x864 --enable-game-mode --disable-random-objects --airport=LBBG

LBBG is the Bourgas airport. and the 2304x864 are my two 1152x864 monitors :-)

Happy flying