for me I added an item power. Just use one of the existing weapon powers as a base for creating the item power. Then I edited it to agile for all descriptions. I was too lazy to figure out the script to take the highest bonus of strength or dexterity, so instead I just added a Weapon Attack Bonus and Weapon Damage Adjustment on the character for the selected agile weapon. Set the adjustment for the poper difference between dex and str and was done.
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