I thought I would post this to help others out. When I import csv data in to a Dataset, I always Overwrite current data and Ignore header row. I wanted those to be the default options.
so around Line 1118 and 1123 in lib\pages\dataset.class.php, change Null to 1
$formFields = FormManager::AddCheckbox('overwrite', __('Overwrite existing data?'), 1, __('Erase all content in this DataSet and overwrite it with the new content in this import.'), 'o');