since we ( or FDS ) strive for ultimate realism, I think we should be able to keep the center gear locked in position if the weight is low enough. Not sure if you knew it, however there is a Center Gear Isolation Switch on the Ldg Gear Ctrl panel. It allows the center gear to remain retracted.
I’m not sure what procedures are for this, but I know it can only be done at certain weights.
You can see the gear isolation switch right next to the gear lever. You can see the locking pin and chain hanging down from it. Unfortunately i dont see any weights that are placarded next to it- nor is the photo clear enough to read them if I could.
I am up for this, since it adds even the last detail into the flight model. Same addresses for the A340, in case you wondered.