I wouldn't think an aftermarket shifter SHOULD let the dealer say no to fix something under a TSB. In my opinion, a TSB like that is Ford admitting, "Okay, this is definately wrong, we'll fix it." 
Or the dealer could be an ass and still say no.
The only things I would be worried about are: 1. How long it would take to fix. 2. Some idiot techs playing with my car while I'm not there.

Or the dealer could be an ass and still say no.
The only things I would be worried about are: 1. How long it would take to fix. 2. Some idiot techs playing with my car while I'm not there.
