From a comment(by one of the unity guys) I found on the unity forum
"When you submit a bug to us through the bug reporter, it goes to our internal bug tracking system FogBugz. After it's checked by someone in QA that it's not private or under NDA, the status is made public, and the Issue Tracker will pick it up and display it publicly on the Issue Tracker site (minus your machine information, logs & example projects, those are kept private). So there is no submitting bugs to the Issue Tracker, it just crawls through bugs that are public and displays them. "
So I guess you don't need to open an issue in issue tracker.