The NOEMBED tag has been deprecated (it was a Netscape only extension) so we are not able to use it. I tried searching for the list of attributes for OBJECT and EMBED tags but could not find any other reference to accessibility. The official syntax is on the Adobe site - http://www.adobe.com/go/tn_4150
I don't think that the content inside an OBJECT tag is not suitable for accessibility as well, because its purpose is alternate content for browsers, that do not support the tag (e.g. older browser versions).
the Telerik team