This is quite important especially in finance where we would want to overlay graphs with other graphs data for analysis. Also would be good to enhance the controls to have more functionality such as min\max lines etc.
Combination charts (having different chart series on the same plot) is supported now, see this demo for details: http://demos.telerik.com/kendo-ui/chart-api/benchmark To specify ranges, you can utilize plot bands: http://demos.telerik.com/kendo-ui/bar-charts/plotbands