Allow to add sprints between existing sprints

Can you add the ability to add a sprint between existing sprints in the Greenhopper scrum planning view. We are using the sprints also as buckets for projects further out and only for the next couple of sprints we then pull from the buckets for proper planning. At the moment, when we create a new sprint between the general "buckets" and the series of sprints for teh weeks ahead we need to create a new sprint at the very bottom and then move the items from the previous sprint to the new sprint, and from the sprint before that to the previously last sprint etc. Very tedious.

While doing this would be fantastic if you could make all sprints, not just the current active spring collapsible. Would make moving around much faster given that new items always fall to the very end of the backlog.