Added new master zone, copy .hosts does not replicate properly

We run 2 BIND in master/master configuration in two geographically separate datacenters. This is done because a master/slave configuration has certain limitations if the master goes down (slave can not be easily modified). The setup we have works great -- we make changes to "A" or "MX" reco

Remove/add [A] records based upon server availability

Is there a method in BIND to add/remove A records based upon server availability? i.e. host www has A records 1.1.1.1, 2.2.2.2, 3.3.3.3 If 3.3.3.3 is 'down' (via a ping test, for example) we remove it from the [A] record until such time that it is back 'up' and the host is added back to the