Datasetitems_form.php interface reworking

When creating a calculated question in the third step i.e. datasetitems_form.php, the various options does not interface smoothly.

i.e. wild card values reset under the Answers tolerance parameters when trying to add items to the dataset.

This issue can be seen in the following screencast: http://www.screencast.com/t/yq8TwRF0La