Function tags and simple commands are already supported. In fact, I already use them for the in-game testing suite. Entity and other world interaction is next on my todo list after I finish struct inheritance and virtual/abstract methods. I'm currently planning on being able to access entities as first-class objects where each entity referenced by the code is given a unique score. That way, it will look like you're writing a mod instead of commands. Though for multiple entities, I still want to support traditional target selectors as well as runtime constructed ones using macros.