To reduce the amount of releases showing up on the GANTT chart of release overview, I would suggest adding the ability to filter on dependency links or not.
Adding this filter capability give the user the ability to focus on release that inter-related to each other versus all projects. I know you can filter on a number of enties, but it is not easily to identify dependent releases when you have 70+ releases a year.
This is exactly what my team needs! We work on an incredibly large product portfolio with many inter-dependencies. The dependency chart is ok, but its difficult to visually see dependency conflicts in terms of timing. You essentially have to read and process each line item instead of being able to focus on a certain timeframe/where you see conflicts from a timing perspective.