Hmm, that is very interesting. I will be very curious to see how the iron man drop retrofit goes - that would make for a sweet upgrade.
I was thinking it would nice to retrofit drops in place of the Navi targets on my Avatar, but on second thought I think in this case it would make the game significantly harder, as the entire target bank acts as one for multiball jackpot and certain mode jackpots. Though I wonder if the logic could be set to immediately reset the bank during those instances instead of waiting for bank completion...