The auxiliary fence that comes with the saw is the same length at the regular rip fence but it can slide in a t type track that runs length the length of the fence. The only time it is mentioned operationally in the manual is to be used as a cut off stop but I don't understand how.
Oh! That's different. That would be for crosscuts.
In that case, you bring the auxiliary fence far forward, so that the back of the auxiliary fence is in front of the blade.
Use the miter gauge. Set the auxiliary fence so that the crosscut will yield the desired length on the auxiliary fence side of the board.
Make the crosscut, holding the board in your hand with the miter gauge. Your workpiece is beyond the back of the auxiliary fence when it reaches the blade. There is little chance of a kickback, because the wood cannot be pinched between the blade and the real rip fence behind the auxiliary fence.
Bring the miter gauge back. Shift the workpiece to the right and repeat as many times as you want to make identical crosscut "cutoffs."
I have done the same thing with a block of wood clamped to the rip fence in front of the blade. Once the workpiece reaches the blade, the rip fence can't pinch the wood. The photo in this article illustrates the principle:
-> My question for you is: Does your auxiliary fence leave enough gap behind it (to the rip fence) to work that way comfortably?