Custody nail-biter over China QFII

One runs a risk combining the words 'custody' and 'nail-biter' in the same headline, but nonetheless global custodian banks are on tenterhooks as they await final details from several Chinese regulators about their role in the new scheme to open A shares to foreign portfolio investors.Custody executives in Hong Kong say if the rules pile on too many risks, they will not participate. "These rules will determine our interest," says James Wong, senior vice president for Hong Kong custody…