The same could be done for RD WebAccess on Windows Server 2008 R2 after applying following hotfix: http://support.microsoft.com/kb/2648402. Although it is not explicitly described in the KB article, this update adds Password.aspx script, containing password changing logic.
Carsten Siemens edited Revision 5. Comment: Fixed misspellings
Carsten Siemens edited Revision 4. Comment: Added tag: en-US
Freek Berson edited Revision 3. Comment: Added a additional link
Freek Berson edited Original. Comment: Added additional sources