You can finally interact directly with the XY-YZ-ZX base planes when starting a sketch, adding a construction plane, mirroring objects, or performing other operations that support using a planar face as an input parameter.
Give it a try using the Mirror tool. Without needing to add any construction geometry, you can now easily mirror a 3D body or sketch by selecting one of the base planes as an input parameter to the mirror tool.
Stay tuned for some big changes to Shapr3D in the next release. Meanwhile, make sure to install the latest version and give the latest feature a spin.