I used to work for PSA and I was the guy who figured out the GPS circuit breaker trick. Though I didn't use it more than few times for multiple reasons reasons.
The CBA states the pilots start getting paid at first movement. The first step in changing the ACARS logic would be to approach management with an LOA. Perhaps they should have negotiated for it when the show times were adjusted.
"Block-to-Block" means that period of time beginning when an aircraft first moves from the ramp blocks for the purpose of flight and ending when the aircraft comes to a stop at the ramp at the next intermediate stop or final destination, as the case may be.
If you're stuck waiting for ramp to allow you to push back have the ramper push you back 5 feet and pull you back to the original location, that usually trips it.