1. Is it possible to shade between two lines? If not, is it possible to change the fill style on an area? EG Stripe pattern instead of a solid color.
2. Is it possible to draw independent lines vertically and horizontally? These would be an extension to grid lines that could appear in the foreground.
3. Is it possible to color in the bars without having to use the color array inside a theme? It seems easy to style a line but not a bar. Also, on group bars, the border color doesn't always match the content color.