Yes. Hitting any of the controls a second time will stop the door, if that's what you mean. If you mean actually manual, touching the leading black plastic edge on the door with even the slightest force will stop it with a triple beep.BTW, is there a manual override to stop the FWD when it is opening?
Using Summon to park/unpark is currently not an ideal practice. My guess is the doors in your garage will not open fully, but plenty enough to exit the vehicle. The problem with partially opened falcon wing doors isn't the rear passenger access - it's the way that low door interferes with the front passengers trying to exit. You get trapped in the triangle of the door swing. Requires a bit of maneuvering, but it works.
I just jump out of the car as soon as we're in the garage and run like mad into the house, screaming, "good luck all ye who exit!"