Really fun! And I bet that, historically, fights broke out over this game, likely leading to someone's demise. Because it really feels like Irvin is cheating sometimes.
As such, I would recommend a house rule: center star decay. Because that position is so absurdly critical, I'd wager that whoever takes it first and simply parks there seems like they're almost guaranteed a win. And if you roll 2 fours in a row, it feels like a slow death for the other player.
So, after a set number of turns of not moving a token from that center position, let's say four, the piece is destroyed and returned to the player.