Bind9 : Allow-transfert

Hello,
I recently migrated a Ajenti on my VPS and it works fine!
I use a lot Bind9 to manage your DNS, I have two ideas:

• Add an input for "allow-transfer" for allowing transfert between DNS servers

example:
In /etc/bind/named.conf:
zone "example.com" {
file "/etc/bind/db.example.com";
};

• Automatic update of SOA serial

2014061202 ; Serial -> 2014 06 12 rev02
if I change something  the serial change for example: 2014061701
This will allow DNS servers to replicate changes