cache_peer 127.0.0.1? and hostname proxy.os.com required?

[WinH]

Hello,

When running the raptor install script, the hostname of the machine is changed to proxy.os.com. Also in squid.conf visible_hostname is set. I have 2 questions about this

1. Is this mandatory?
2. Why is this happening?

Because I prefer to keep my own hostname and domain name...

Also in the squid.conf the cache_peer is set to the IP of eth0 NIC. But sometime my IP changes so that's why I prefer to set this to localhost 127.0.0.1 because it is more flexible. Is this a problem?