I would like to see some feature enhancements to the Drill-In feature.

A double-click into a data bar or a pie wedge is much more user-friendly (and requires no training) if reports are to be exposed to users who do not operate in Zendesk in a regular basis.

The decompose is a passable solution, however it does not allow you to adjust the chart type between your initial result and what you are looking to drill down into.    As a drill-down the number of results may change drastically, depending on what you are looking for as a result, which could make your original chart type not ideal for your results.