I was using piwik since 1 year as self hosted environment. I was able to filter reports through segment controller. Although it is satisfying all of my requirements but I have to define each segment explicitly.
For some specific custom variable I have multiple values and I do want to filter my dashboard on the bases of these values. So I do want to add a set of dropdown list at the top, which can filter the dashboard below. Please see attached image
The set consists on 2 dropdown lists. One to hold all custom variables and other to hold the values of selected custom variable.