PDO and PostgreSQL's LISTEN/NOTIFY

Is anyone aware of any effort currently underway to add support for
PostgreSQL's LISTEN/NOTIFY (async notification) feature to PDO?

At present the notification mechanism:

http://www.postgresql.org/docs/8.1/interactive/libpq-notify.html

is only available within PHP whilst using the old-style API:

http://www.php.net/manual/en/function.pg-get-notify.php

Unfortunately this means that applications ordinarily using PDO have to
include a mixture of old/new APIs (and separate connections/sessions) if they
want to receive notification messages. I was thinking of putting some time
into proposing an addition to the PDO_PGSQL driver:

http://www.php.net/manual/en/ref.pdo-pgsql.php

but didn't want to duplicate effort if someone has already written the code to
handle this feature.

Thanks..