There is a built in wizard already. With it you set up the basics of the virtual interface, create a certificate, automatically makes the firewall entries, generate certificates for users,
I'm not quite sure where this request is going. There is in fact a large market for this request...If it were truly auto-configured out of the box, that would be what most people call a 'back door'. People pay good money for reliable back doors. One can't also assume every installation has a failover partner.
Certificates are good, and generating them is simple. If you want something with a 8 character username password combination instead of a large cryptographic cypher...well that isn't a VPN at all...