Version 3 of my config!
Selective routing is done, IPv6 firewall and tunnel is pending.
For selective routing, I use route policy and a black hole route to make sure it’s either WAN1(or WAN2) or nothing!
All the local traffic, Traffic touched by DNAT rules or route policies has to excluded in load-balancing system.
In Load balancing rules, I can not specify groups so I have to add a rule like this 
rule 6 {
description "Exclude WAN4 traffic"
destination {
address "0.0.0.0/0"
}
exclude
inbound-interface "br0+"
source {
address "10.0.50.21"
}
}
WAN4 only clients are not in a single chunk and luckily there are a small number of such clients so I can add a few rules like this and move on.
conf.txt (51.8 KB)