Another small update, mostly to post a:

Bug Squash report- There was an error in the Navigation Arrow logic for players 3 and 4 that made the arrow always point back to the starting line, I believe this has been addressed. 

And more exciting than that:

Battle mode (experimental) is now operational!  Just toggle the race button in the main menu so it instead reads "Battle" and jump right in!  Two levels to try out so far.