Thank you for the idea. The release status is not tied to the features status by design. Releases in Aha! provide a tool for managing the complete cross-functional effort of delivering a new customer experience to the market. Since there may often be activities that take place after the actual functionality has been shipped the release itself may not be completed as soon as the last feature is completed.
Given the use of releases for managing cross-functional product launches we are unlikely to implement this idea at this time. However we will keep the idea open for additional feedback.