Changing Shared Address from Individual's details in Profile or Edit Form

Currently if two people share an address and are configured as "Shared Household address" - the "shared address' cannot be updated from the individuals record.

Moreover, if update is made to one of the individuals records via a Profile or View My Details then the 'Shared Household Address" appears to have changed in their record (ie it shows the change within the 'Shared Household Address' block in the Edit page, and on the Summary page but does not actually update the Shared Address.

Ideally if a Profile shows the address of someone who has a Shared HH Address then this will be communicated via the interface - eg a check box that is checked and if the person changes their address details they need to check one of two boxes, one which says 'Updated Shared Household Address" the other says 'Update my personal address and remove me from the Shared Household".

And it should be possible to change the HH Address in the same way via the Edit Form again enabling user to specify if the change is to 'update the shared address' or is to 'update individual address and removed contact from Shared Address"
http://forum.civicrm.org/index.php?topic=3482.new;topicseen#new