I would like to add a % of how far complete the release phase or feature is on the roadmap. Please can you look into doing this?
Great news! It is now possible to track progress on goals, initiatives, releases, release phases, master features, and features. The percent completed can be entered manually or automatically calculated based on related records and can be visualized using progress bars on roadmaps.
Check out the blog post for more details.
I have implemented this with a custom field - however something a little more sophisticated would be better.