Here's my vote.
I absolutely think that a help file for the program with explanations of what every single thing does is the highest priority!
I've watched and am watching a number of projects develop. A word of advice.
Currently, everything so far is clear and well thought out. What's missing from getting big time interest is a camera mounted or chasing an object for that First Person view. When that's added, the newbies will burst through the door.
I would recommend you have all your ducks in a row and all your docs up to that point done before you take that step. A multitude of noob posts can be very distracting and you can easily loose your aim and focus.