The Browse Users page can be improved by changing the filter form so that the "Add filter" button submits the form when the user presses the <return> or <enter> key on their keyboard. In this way it would follow conventional web usage whereby submission of a form is possible by pressing the <return> key and "advanced" searching requires actively clicking the link or button for the advanced searching tool in question.
As presented to users, filtering by full name is the most common use of the filtering tools on the Browse Users page. It is the default feature and as such should be "wired" to the <return>/<enter> key.