Create a custom rewind button?

I was able to accomplish this with the SDK. I modified the timeline to allow you to scrub backwards, but not forwards. However, I lost so much of the functionality of the storyline player, and without enough information to rewrite all of the missing pieces, I had to abandon the project. 

The code needed to make this change in the player was really pretty simple. It seems to me that is shouldn't be that difficult for the Articulate engineers to add this as a feature to Storyline.