quota-plugin + namespace with wildcards?

Hi all!

Is the quota-plugin (quota + quota-rule directives) supposed to function for namespaces that are generated dynamically for shared mailboxes? (namespace=shared/%u with %u expanded from userdb)

'Cause I cannot find anything in the wiki that suggests it can't be used that way, but it ain't a-workin'... :o(

Thanks! Jost