If you're on the last entry and hit down, the focus should cycle to the top (and vice versa for up arrow at the top). The utility is that the first result is often the correct one, but the default focus is on "search". You can keep the benefits of expanded search without the inefficiency of mouse movement or multiple up-arrow clicks by allowing the down-arrow to cycle to the top.
Another little UI shortcoming in Infoplus that prevents it from keeping up with modern UI.
Totally agree - Quick Search would be way faster on the keyboard with this.