allow html embed only for site admin

Html embed for sitewide embed by site admin will add flexibility to add more media content. Is there a way of making it?

For example, Simplemachines Forum allows admin to use html tag, so that I can use df2 flash gallery http://www.dezinerfolio.com/DFGALLERY-2/FREE-FLASH-GALLERY?page=30&PAGE=47 to add flash gallery where photos come from picasa through xml. Is there a way that I can do this will elgg through a plugin?