I have come across this need of the time from my multiple Project teams as well as from different organization across the world for a multi assignee field for an Issue, even though, be for team managed project at least. The proponents argue that in today`s agile world to save time, a single issue needs to be worked by multiple users to complete in less time. That's what it's happening in multiple organization across world. The opponents argue that there will be difficulties in tracking the real work, if assigned to multiple assignees and also there is chances of ownership issue. Nevertheless, they also are convinced that a single issue needs to be worked by multiple users to save time in this fast-paced agile world. However, as multiassignee field is not currently available in JIRA, there is no way to capture the real work from different assignee for that issue or project to say.
Many of our elite community members have suggested an out of box work around for this to use a Customized field with multiuser picker/ Group picker. This may work for small or few projects. But in real practical world, this may not be a solution. I urge Atlassian to consider this in their next upgrade and also request our community gurus for a better work around for today`s agile development environment.
Please do share your thoughts and ideas on this. Will love to know them. Thanks.