Of course, you can achieve that using rw_display_widget() filter, for example if you want to display your widget on a category of ID 1:
function custom_rw_display_widget ($display, $instance) {
if (is_category(1) && $instance['title'] == 'Your widget title') { // change Your widget title
$display = true; // or false if you want to hide it
}
return $display;
}
add_filter('rw_display_widget', 'custom_rw_display_widget', 10, 2);