Allow stacking of series one over another. Check the attached project for a possible approach for working this around.
Implement a provider allowing the customers to create dynamic number of series.
Add 3d chartview IsInverse axis options.
Add lines series support in the new 3D Charts. A Line series is pretty similar to PointSeries3D with a Line [a tube] that connects points.
This can be integrated in the Chart3DCameraBehavior. The user should be able to pan around the viewport. And also to zoom based on the mouse position. Currently, the zooming is based on the center of the viewport.