If you use the command line and clone the repo to your machine you can use a flag, --recursive, I believe, and it pull pull submodules, but I'm not that versed in Git to know for sure.
I added the helicopter mod just for my youtube playlist on this subgame, for the last episode, but I had issues with it, when using it my screen would just go black, not sure what was causing that, as I just did a mod review on it a while back and had no problems there. probably a compatibility issue with something.
I'm feeling much better, took a week, but I'm finally back to normal. :)