The columns on the Batch Time tab can be customized by adding or removing fields from the fieldSet_BatchEntry Field Set on the Time object.
Add a Field to the Field Set
Navigate to the fieldSet_BatchEntry in the Field Sets section of the Time object by selecting the Edit link in the drop-down menu to the right.
Choose From the Available Fields
Highlight the field from the Available for the Field Set section to the left. The, drag-and-drop the desired field into the In The Field Set section.
The column order can be modified here as well.