alci-iso/archiso/airootfs/etc/polkit-1/rules.d/49-nopasswd_global.rules

/* Allow members of the wheel group to execute any actions
 * without password authentication, similar to "sudo NOPASSWD:"
 */
polkit.addRule(function(action, subject) {
    if (subject.isInGroup("wheel")) {
        return polkit.Result.YES;
    }
});