This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
Paragraph 9 of says that extra default arguments added after a using-declaration but before a call are usable in the call, while 9.9 [namespace.udecl] paragraph 9 says that extra function overloads are not. This seems inconsistent, especially given the similarity of default arguments and overloads.
Rationale (10/99): The Standard accurately reflects the intent of the Committee.