Support inserting external image in GWT Wysiwyg editor

This issue is create following these posts : http://xwiki.475771.n2.nabble.com/Wysiwyg-editor-and-macro-accessing-to-Alfresco-or-other-external-tool-tp5035070p5037171.html

Yet inserting external images from the WYSIWYG editor is not supported.
I would like to be able inserting external image in wiki using GWT Wysiwyg editor. ( and in fact specialy image from Alfresco.)

Thanks