fill area between line charts with different set of x-axis indices

[ghost]

In the fiddle attached below, I would like to fill the area between the 2 line charts.
But this seems only possible if both the lines have common set of x-axis indices.

http://jsfiddle.net/MrHunt/Fq369/3/

Please add this enhancement OR give steps on how this can be achieved.

Thanks.

[guiann]

I would be glad to read the official answer to this. Is there any simple way to fill the area between to series ? It seems a pretty standard need but I didn't figure it out yet. Every existing method is about adding dummy series, but it doesn't fit when the real series don't share the same x/y Axis.

Example : using stacked areas, but if there isn't a common point, it can't be done: http://jsfiddle.net/mKABN/302/

[TorsteinHonsi]

The fix applied to the initial fiddle: http://jsfiddle.net/highcharts/Fq369/4/