Mouse pointer over non editable elements in TinyMCE

Solution 1:

IE only supports CUR and ANI as formats from CSS to change cursor.

{
    cursor: url('/cursors/customMoveCursor.png'),      /* Modern browsers    */
            url('/cursors/customMoveCursor.cur'),      /* Internet Explorer  */
            move;                                      /* Older browsers     */
}

Please look here. or a good link here

Have you tried to edit the CSS for TinyMCE like (tinymce/skins/lightgray/skin.min.css)

add what you need. Example:

    .mce-grid td.mce-grid-cell div[disabled]
{
cursor:not-allowed
}

I still recommend using .cur file for IE.