How customize the template and image dialogs

I am trying to customize the following dialogs: Template and image

Template Dialog:

I would like to change the default for the 'Replace Actual Contents' checkbox so that it is not selected by default.

Image Dialog:

I would like to change this dialog so that 'Lock Ratio'  is set to lock.

I know I can customize the dialogs by doing something like:

    CKEDITOR.on( 'dialogDefinition', function( ev )         

{           

         var dialogName = ev.data.name;             

         var dialogDefinition = ev.data.definition;     

         if (dialogName = 'template')

         {

         }

         else if (dialogName = 'image')

         {

         }

}