[mcnallym]

Not strictly true. You can specify that certain traffic when in Load Sharing can go out via the first link. You cannot specify traffic to go the other link. This would still be load shared across both links.

Also all Static NAT goes out only the first ISP link anyway.

Also this affects all gateways not just one so I wouldn't really say it is a good enough solution for what he wants.

ISP redundancy is OK as a starting point for maybe small companies, but still not substitute for a real load balancer.