Our Jira team won't make the Sprint field editable because of advice from Jira support. This makes the feature unusable for us as it literally takes 2 minutes to change the sprint for a Jira item vs. 2 seconds if the Sprint field were made editable like fixversion. Requiring people to use the drag and drop interface is very time-consuming if they are already in the Jira item page. We have too many tasks and too many people to train, so we'll have to continue to use the classic features.
The fixversion field was editable, why not make the Sprint field editable or at least not advise IT people to keep it read-only? I've always been a fan of Jira, Greenhopper and Atlassian and I welcome the addition of the Sprint field, but if you phase out the ability to quickly edit the Sprint we'll have to look for alternative systems.
Edit Fix Version From Jira Item Page (Classic Functionality)
1) click on edit icon
2) type in fixversion with help of suggest list
3) hit check button
Total Time: 2s
Edit Sprint from Jira Item Page (New Functionality)
1) Select View on Board
2) Switch to Plan Board
3) Find Jira item
4) Select jira item on plan board - displays details on right
5) Select "Remove from Sprint" from gear icon on the right
6) Jira item is moved to backlog
7) Find Jira item in backlog
8) Collapse sprints for easy dragging
9) drag to desired sprint
Time: ~2 minutes