I mean I 'know" (100%) that its possible.
Well it is not.
There is no way to detect if that switch is conducting from a tilt or a swing.
If the switch got old and was tarnished inside then you might have a situation where it needed extra force to push the ball into the contact. This would be provided by the extra force the swing gives it. But there is nothing in the signal output that could determine if the contact was closed quickly or slowly.
I have just been taking each lead and putting one in pin2 and the other to GND.
I hope you have a pull up resistor or have enabled the internal pull up resistor.
I use these sorts of switches in an alarm pager product where it registered an alarm if tilted. That is if the wearer fell to the ground. Problem it proved to be very unreliable sometimes needing more of a jolt than it got. We had to use these sorts of switches because the reliable mercury switch has been banned in Europe.
It might be possible by looking at the state of all three switches mounted like this to detect a swing. Is that what you mean?