Pitching this once again to see if it's possible: Can a function be added to allow games to add a Safety Waiver to the website, and when players join a game, there is a box present that says "By clicking this box, I agree to the Safety Waiver" or some other such phrase. That way, you don't have to worry about tracking down every single player and getting one signed for them in person - the website takes care of it for you.
It's not possible yet, but that one is on our long todo list
Right now, we're finishing up the read-only API. Then we're going to start the read/write API. Once those are done, people will be able to write apps and such.