Block / Menu display for sub-domains

Is there a way to decide which blocks shoudl be displayed and where per sub-domain ?
The assumption is that all the blocks are defined in the master site, but their display is defined by sub-domain.

For instance, the master site may want to display the domain switcher, but not the sub-domains.

Same question for menus; The domain_menu module seems to provide this for the primary and scondary links, but doe not provide fine-grained customization of which menu items are displayed.

Copying the tables for each sub-domain would work as a one-off solution, but not for any blocks/menus defined after the sub-domains have been created.

Did I miss this feature in the documentation, or is this not part of the current feature scope ?