[mototom]

At a minimum, it should be checked by default.

This isn't the behavior anywhere else, though. HLO doesn't know if I'm attacking something that's immune to Fire damage, but it doesn't make me toggle a Flaming Rune on for every attack.

Rogues have a toggle, but HLO has no way to know if the enemy is flat-footed so that makes more sense.

Edit to add: I am realizing I only have to turn this on once for a given character, since Precise Strike Finisher Damage overrides it when turned on. So one can turn it on and leave it on, and the setting persists after you turn off Panache (but the bonus damage isn't included when Panache is off).

So this is a really, really minor QOL enhancement, but I still think it should be toggled on by default.