You would have to edit the core source files.In this case you would need to add the url to the regex that decides what to not strip infile: /include/class.format.phpcirca line 325.Line looks something like: 'iframe=-*,height,width,type,style,src(match="`^(https?:)?//(www\.)?(youtube|dailymotion|vimeo|player.vimeo)\.com/`i"),frameborder'.($options ? '; '.$options : ''),I'm not sure what you would need to add here however for google maps (since I have never tried to add maps).