Frankly: There is no way to inhibit the FileMaker Tutorial on Pro and Go after the installation.
FileMaker is both a platform and a collection of products and no more often do the two collide than when we are trying to sell a custom FileMaker solution as a product.
It would be great if FMI would go that extra step and give FBA/SBA members the ability to deliver ever so slightly customized version of FileMaker Pro so as to give their users a more seamless experience. Go is more problematic as it's in the App store which limits what can be done.
If you open your file when first run after install, the tutorial will not open. So you have a chance to write registry on Windows, but I don't know how do it on Mac or Go...