How do I force a particular server or end-user to use WAN1?

Network Load Balancing
This can be done using Vector Mappings.  Vector Mappings are used to force traffic from a specific host out a specific WAN interface.
 
Vector Maps are also used for ensuring reverse mappings for NAT rules.
Vector Mappings can be found in the EdgeNAT tab in 3.3.x and the NetBalancing tab in 3.4.x

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