This is my understanding of the function of the starter and bromide, and someone correct me if I am wrong.
Originally Posted by David Lyga
Bromide is the restrainer, which is not put or needed in replenisher, as it was already in the original developer when it was first mixed, and continually replaced as a by-product of development. The restrainer (usually bromide) is needed in nearly all developers to prevent unexposed silver halides from developing, producing fog.
Now, If you want to make a working solution out of the replenisher, then you must add starter, which has bromide (restrainer) in it. As far as I know, the only use for starter is to make a working solution out of replenisher. I don't see how it can be left out for one-shot development, even with a time adjustment.