Erroneus event

Is it possible to define or specify a response which excludes the required two answer keys in the event editor window? I have an event that provides a feedback of an erroneous response as a result of typing illegal keys on the standard computer keypad. The legal keys consists of only two possible previously defined keys, thus illegal response keys are actually most of the computer’s typing keys except the two selected legal response keys.

Keys that you mark as correct will be recognized as such by SuperLab. All other keys will be considered incorrect whether defined/setup as a response or not.