Using the MFT as a work station with the circular saw, someone made a kind of hook that attached to the far end of the rail (over the pivot point) that would keep the saw from falling off the rail when the rail was tilted up to uncover the work surface.
When you've got the work piece sorted out on the table you just tilt the rail back down into place and slide the saw back to the start position.
Even if you need the rail down to position a cut line against the splinter guard, with the saw's weight over the hinge it's still easy enough to adjust the work piece. And with the saw on top of the rail you have all of the table surface available without needing to put the saw on the floor or a stack of something it could fall off of.