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Ok, self answering with my findings... there is no special configuration required and ipv4 mapped ipv6 address is automatically generated with the getaddrinfo() function.

As a example, try ssh'ing to your ipv4 mapped localhost as:

# ssh  ::ffff:127.0.0.1 -v -l root
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to ::ffff:127.0.0.1 [::ffff:127.0.0.1] port 22.
debug1: Connection established.