When a user reports an issue, it would be good to provide a template in the description field that prompts them for specific details.

Martin suggests

I think a little JS in the theme that looked for the current page being http://tracker.moodle.org/secure/CreateIssue.jspa and then seeing if the description field was blank, and if so, then inserting some text which described how to write a description in text, followed by a bullet list for the steps...