There is a Jira screen shot tool called "Capture for Jira" which describes itself as "an essential tool for every development team delivering quality software."
I would agree screen-capture is an essential part of bug tracking. Fogbugz has long had a screen-capture app for easily taking a screen shot, drawing on it, and sending it to a new bug.
Why is this functionality not part of the core platform? Why does Jira require purchasing an extension to get such basic functionality?