The problem: We have periodic times when tunnels go down, or the ISP sucks and we have high packet loss or latency and need to switch from WAN 1 to WAN 2. When the MX is in a template, you cannot do that unless you do it at the template level. We don't want to flip all our locations over, just a single one.
The solution: Allow overrides for WAN interface selection. There are overrides for about everything else when using a template, why was this skipped?