Whether the Federal Reserve Board's Federal Open Market Committee lowers U.S. interest rates at its Sept. 29 session or waits until Nov. 17, the vital, longer-term matter of structural economic reform will remain far from being resolved. Although finance ministers and central bankers from the world's most-advanced industrial nations and several economically emerging countries are slated to start work in Washington, D.C., by mid-October on recommendations for strengthening the global financial system, their preliminary report on reforms isn't due to their respective heads-of-state until New Year's Day 1999.