I'd like to have an effort estimate for upcoming versions of my software in its Roadmap in Mantis Bug Tracker.
I could figure out easily how to add a custom fields (integer type, called "days to complete") to issues, and how to show it on the "view issues" page. But I couldn't find out how to add something to the roadmap showing the sum of days to complete for non-resolved issues.
Is there a built-in way to do this? My guess is no, that would take some php coding inside Mantis. But maybe someone did that already?
Edit: I had a look at the Time Tracking feature. It doesn't look like what I want.