If you work with “pixols” that is in 2.5D with elustration pictures then the 3D model when positioned on the document rotates another tool - the Stroboscope. This tool is extremely uncomfortable and working with it takes a very long time.
How to make GIZMO appear in his place?
Why is the GIZMO tool still not made single for all operations in ZBrush?
As far as I know, there are no plans to extend the Gizmo3D to 2.5D usage.
The Gyro is not difficult once you learn the basics. You can read about it here:
http://docs.pixologic.com/user-guide/2d-illustration/the-gyro/
Thank you. Your answer helped me.