So is the consensus that this feat can be used to create Spell Trigger items/completion items like scrolls and wands?
I know that the item creation rules state that the prepared slot is consumed when crafting a magic item (though not necessarily cast). I guess the question boils down to if the feat text of "you can cast any spell as if it were one of your prepared spells..." actually means that it's prepared, or simply that it can be cast. Can I split those actions: Prepare the spell, but not cast it?
If you could craft a scroll using this ability, would you also be able to use it to add a spell to your spellbook (provided it's on you class list)? You can write prepared spells to your spellbook by consuming the prepared slot.
If both those things are true, this feat offers even greater versatility, because you can use it to expand your spellbook without consuming scrolls or paying the fee to use another wizard's spellbook.