Too late for the compo, but not too late for posterity: made a small update to multiplayer to cycle the starting player, after realizing how much of a disadvantage it gave player 1 by having them always go first. (Now the current leader always goes first.)
I decided to port the game to FDS, just in case someone wants to play it that way. The game isn't any different, it's just rebuilt for the disk format.
Also a while back I made a "tournament edition" that makes the course generation deterministic and lets you specify a starting seed, in case you want to compete against others on a specific course.
I also updated it to add the Tournament Edition capability to the regular ROM, so they don't have to be separate ROMs anymore. Just a quick input of a code on the title screen to activate.
It also has a soft-reset feature now. (Especially useful for tournament edition mode, where it will remember your seed.) Not sure if Action 53 vol 4 is still receiving updates, but this would be a small improvement.