Throwing Shield weapon & runes.

[Outlawzero]

Does the weapon throwing shield described as special straps & weighting that fits over a shield or buckler & allows for quick doffing & throwing count as a separate item for rune while still allowing runes to be placed on the shield it's self separately?
https://2e.aonprd.com/Equipment.aspx?ID=1561

[Finoan]

The Throwing Shield was created before Shield Runes were in existence, so we have to do some forward compatibility adaptations here.

I would likely allow both shield runes and weapon runes on the shield. Weapon runes to increase the capabilities of the item when used as a thrown weapon and Shield runes for when the item is used as a shield.

The shield already doesn't allow attached weapons, so there isn't a problem there.

I also question allowing the weapon runes on the shield to apply to Shield Bash since shields don't normally allow weapon runes. I only question that because weapon runes on a Throwing Shield aren't specifically allowed either - but not allowing weapon runes on the Throwing Shield at all means that it can only be a weapon at very low levels. Allowing the weapon runes on the shield but having it not apply to Shield Bash makes the Throwing Shield match the behavior of a Throwing Shield Augmentation - which can also have weapon runes on it that wouldn't apply to Shield Bash.