I’m going to collect my gizmo issues in this thread!
Also, I wouldn’t mind looking at the source to see if I can fix these myself - but I was unable to find the source files related to the gizmo
The transform gizmo jumps when clone-dragging with multiple objects selected.
It can get very disorienting - the gizmo changes both position and orientation, as if you selected another object last.
When dragging an axis of the gizmo in the 2D view, it sometimes moves as if it measures its offset distance projected along the wrong axis.
If I move the cursor perpendicular to the axis at hand, I expect it to stand still, which is the case most of the time.
It also happens when dragging the two-axis drag, which is even more disorienting.
The planar drag handles can get in awkward angles, where it’s near impossible, if not impossible to drag without another plane covering it.
It would be nice if you could make the planar handles follow the camera around!
Here’s an animation of how it works in the Unity engine: