Looking for Storyboard Software

It seems to me the storyboard for WBT should be like a storyboard for a movie. It roughs out what each scene (slide) will look like, what will be said, what type of actions (animation/interactiions) will happen. From there the director and producer (WBT developer and SME) work off the PowerPoint file or the html of the presenter published files. However our company has started a policy of issuing a storyboard document that is updated to capture a lot of detail about each slide after the product is finished and having the SME and content manager sign it for approval. There is little to no emphais placed on using the storyboard to communicate with the SME on what the product should contain. Is this an accepted practice, i.e. update the storyboard to capture details about the finished product, or is there some other document that is used to do that instead of updating the storyboard?