What does this feature do?
In the menu bar at the top of Traq, it contains a link to the main project overview, Profile, UserCP, AdminCP, and Logout.
It would be a nice addition to the global settings to offer a way to link back to the parent site (or really, any other site if you want).
What makes this feature interesting?
This would help improve navigation without needing to remember to open the tracker in a new tab or window all the time - or be forced to open a new tab or window to get back to the main site when you forget.
It ensures that, no matter how or from where you reached the tracker, you can always return to the site for which it supports without feeling like you need to jump through hoops to do it.