Group packages on a specified level In "components" service

It would be nice to group the results on a specified java package level in the "components" Service.

Example: imagine you have the following four packages:

net.sf.pmd.core
net.sf.pmd.cpd
net.sf.checkstyle.core
net.sf.checkstyle.report

I specify the grouping package level "3" and the component service shows the following table:
net.sf.pmd 95% ... .
net.sf.checkstyle 89% ...

The treemap should also only show this 2 components in this case.

This would allow us to quickly identify the quality of our "components", which are seperated at the third package level in our project.
Additionally, the tree map would become useful for us (Our project consists of more than 800 packages)