It may be necessary to changes the way boolean criteria are displayed in the search tool to allow the label to be displayed on the right of the checkbox, see attached screenshot

ExtJS allow this (boxLabel and hideEmptyLabel config param must be used), but currently it is not possible to configure the desired widget parameters for a search criteria (parameters are by default inherited from the ones defined in the content type).

The scope of this issue could be more general, and could be an improvement of the form "Allow widget parameters to be defined via search criteria".