What does this feature do? In Tickets listing, there are all sorts of filters, except filter for Assigned to. This feature would add filter "Assigned to" to the filter list, so you can filter your tickets based on this criterion.
What makes this feature interesting? It can be useful in multi-user environment, where developers are organized in hierarchy (not peer to peer). As the manager, you can have better view of who is doing what, or who has done what. Also as the subordinate developer, you can filter tickets to see, what's been assigned to you. It is currently possible to see that in UserCP, but the listing there does not have other useful details, such us priority color etc.