There's no way to activate it, this feature is currently not implemented.
As you know, the chordata system is still on prototype stage, and it was built by a small team with minimal resources.
We would love to add the "root bone translation" right away, but it requires implementing complicated algorithms which is something we cannot do with the resources we have available at the moment.
If you want to see this feature become real please help us spread the word about the upcoming kickstarter campaign. For example sharing videos of your working chordata suit would be great. I guess you are the first of this round to have it running!
Also take a look at this thread where we set up the basis for the implementation of a root bone translation algorithm. In the thread you will also find the link to the WIP code repository