I can see When the JIRA issue was last updated with the Updated field, but I don't see how I can get Who did the update. I would provide an easy way to see tickets in my filter that have had outside input and therefore may need my attention.
Update:
So, since I don't want to change the status of the ticket, would it still be possible to create a custom field (not hidden) that gets updated to the username of the user who last updated the issue using a custom event listener or a post-function? In addition, can this custom field be displayed in the JIRA list?
I am not a JIRA administrator, so I would have to ask them to create this and I want to make sure it will work before I give them the task.