Display Release Progress based on Feature Statuses (other than Complete)

MS Project does a great job of calculating the % completion of a project (aka release in Aha world) based on the % complete of each task and it's subtasks (aka features in Aha world) within the project.  The closest Aha comes to this in its various Release Portfolio views is it show the overall status of a Release (which is manually set) or a darker portion of a bar that indicates how many features are complete.  As a PM or Portfolio Manager, I want to have a view of all the releases we are managing and quickly be able to see if we are on track. This would be easy to do in a Gantt chart that shows the typical horizontal bar, the vertical line showing "today" and a progress bar to indicate completeness, which is calculated by the % complete of each underlying feature.  For example, if a feature is in "Not Started" status, it is 0% complete, if it is in "Design" status it is 20%, Development status 50%, Testing 75%, Complete 100%.  Allowing users to set a % to each feature status and then using that to calculate an overall status for a Release (and even Phases within the Release) would make Portfolio Management more accurate and simpler.