No idea, but since there already is a setting like "Enable Config Sync" I guess it should be somewhat easy for PA to fix this if you file this as a feature request through your sales engineer.
I mean setting up HA but only enable "Enable Config Sync" and disable sessionsync etc.
At this time we don't offer an HA solution that allows you to oversubscribe your firewalls. The reason is that a failure will be unpredictable if you're trying to push >100% of a firewall's throughput through it. In fact, our general recommendation is to size the pair so that a single firewall can handle ALL of the traffic through the pair just in case there's a failure.
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