So this is currently a limitation of the HC-JOY-G3 itself and not a limitation of the camera.
As an example the PT-JOY-G3 does feature the ability to simultaneously pan, tilt and zoom (confirmed a minute ago)
This is also something, due to feedback we have received, we will be resolving in future designs that support RS232 or RS485 control.
You mentioned having trisynchronous motion via the presets... this is actually an available experimental feature currently released firmware.
Please see the PTZOptics Knowledge Base article linked below covering how to adjust default preset speeds and enable trisynchronous motion for preset recalls.
This can take some playing with to get just right but definitely is an improvement to the standard robotic movements.
If you have any follow up questions please don't hesitate to return to the PTZOptics forums.
One of my colleagues reminded me that there is a method of gaining control over Pan, Tilt and Zoom.
On the HC-JOY-G3 if you start with a Pan, Tilt or mix and then apply Zoom you can move all three (3) at the same time.
If you start with Zoom first it will prevent the trisynchronous control capabilities.
If you have any other questions please do not hesitate to return to the forums.