>I don't think you should control the way user's browsers are set up. Are you sure you're unable to fix your application for Compatibility Off ?
Try to use HTML5 with IE and have the 3D border effect to be removed. The only way to have this is to go back to 4.1. But, with HTML5, the only way to have it off, is to turn off Set Compatibility. This is not a problem with other browsers.