Version 4.7 will have the ability to add in your own content packs. Right now it is a bit difficult to set up, but I am sure they will be adding in a more streamlined way to create the content packs soon.
Here is the post by Marc Audy replying to my question on how to create the content packs:
No promises here, but I am thinking of throwing together a quick little app that will let you select the files you want and then run the command line script. It should be pretty simple to create and would make a much simpler process, I’ll let you know if it works out. 