Several people with 2015+ Mustangs have asked about the hanging RPM that happens during a shift, as well as the launch assistance. I've just added the parameters for this and they will be available in tomorrow's build of VCM Suite 3.4.
I have add this to Focus ST, Focus RS, 15+ Mustang GT and Ecoboost
Gear Shift Hang allows the PCM to sort of hang the throttle open some (slow decay) to make normal shifting easier. Some people hate this.
Also, the Launch Assistance requests additional torque from the engine when you pull off from a stop.
GSH_LAUNCHASSIST.JPG