MBS issuers and investors endorse many aspects of the revised qualified residential mortgage requirements recently proposed by federal regulators, but there are concerns about requirements for other asset classes included in the new risk-retention proposal. Issuers of non-agency MBS, ABS and commercial MBS backed by collateral that doesn’t meet certain qualifying requirements will have to retain risk on at least 5 percent of the deal, as required by the Dodd-Frank Act. Major industry groups have asked the regulators for more time to weigh the new proposed rule, which set a public comment period that ends Oct. 30. Richard Johns, executive director of the Structured Finance Industry Group, offered...