PgHosts

I posted this question a few days ago when people were talking about PG
7.4 (or later)
features....but I guess it was not posted (processed, etc)...so here it
is again...

I am wondering if it is possible for Pg to support a feature (as in
Informix) where
I can have a host mapping configuration file such that

db = { host, database }
or
schema = { host, database, schema}
or
table = { host, database, schema, table }

Currently one has to resolve (or switch) at connect time where to
connect to, but with this
switching layer, the application can help out a bit on the HA...

Thanks