You can process multiple items at one time.
For attributes within a single element, just mutli-select the attributes in PSE, then, in the attributes pane, Choose the "Excluded" option from the properties drop down.
To process multiple attributes from multiple elements, Perform an Attribute Search from the Search menu. Execute the search and hit OK. The list of attributes will be in the grid pane in PSE. Multi-select the ones you want (Ctrl+Click, Shift+Click, or Ctrl+A) - and again, use the Properties drop-down on the right to Exclude them.
Finally, PI Builder is also another mechanism to do this.
Unfortunately, adding a single line for Excluded in the form is difficult. There are 16 different possible check boxes, and there is not space to allow a check box for each.
