Federal regulators this week began wrapping up a decade-long rulemaking project that updates bank and thrift capital requirements for certain mortgage transactions with recourse features and levels the investment costs for high-quality mortgage securities. The Federal Deposit Insurance Corp. became the first regulator to approve a new final risk-based capital rule that combines two earlier proposed regulations: a March 2000 proposal on recourse and a September 2000 proposal on residual interests. The agencies had been