it's on the list and will be added in a future release, but it's a bit more involved to do this than for other types of chart because of the number crunching that goes on behind the scenes to show you a customised view. Because of this, it causes a bigger load on the database server as the chart cannot be served from a data cache (most other charts can be pre-computed before they are served, but a custom chart cannot).
We are currently working on scalability improvements to the site as a whole which should mean that we'll be able to offer this expanded functionality once those changes have been completed.
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