You can use the editable.remove option in order to prevent the Delete command. And in order to stop the cut command, you can set the copy.enabled option to false.
As for hiding the delete button from the toolbar, once added explicitly to the collection you can use only CSS to hide it. There is no available method to remove it from an already initialized tools collection.
These suggestions can be tested in this dojo: http://dojo.telerik.com/UxIbu.
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