weaning from plugin

Hi Ron or Donncha: It’s been a wonderful plugin that has served me well over the years. But I’d like to wean myself from it now because of a change in the way my site operates. However, I don’t want to change the way past posts work. Problem with deactivating the plugin is that it deactivates the permalinks on the duplicate/tags posts that redirect to the original post. Is there a way (or hack) to deactivate the plugin without doing that? Alternatively, is there a fork of the plugin, or a hack, that will allow post tag duplication to be optional per post?