see how some plug ins edit your styles?
well what if i had a plugin installed and then added a new style , how would i know how to mod the new templates?
Maybe he means with all the hack installed in one style what do you have to do for the new style. By my understanding. And to answer that you would do the edits that the hack instructs to the new style.
Easiest method to deal with that is have a parent style for all your styles, and apply all "global" hack template modifications to it, then the children (the styles your users can select) have those edits applied automatically.