While looking at the roadmap view, it is quite difficult to pin-point the exact date when a release is scheduled to start. Having the release start date displayed in the release details would be very beneficial. Although it is not a field that can be customized, just having the ability to view it in the details would be very advantageous.
Thank you for submitting this idea. You can view this field on the Release > Details page by selecting the "Progress" tab in the bottom half of the page. We are exploring ways to make this clear or move the field altogether. Thanks for the feedback!