Thank you! I hadn't even thought about using it as a plugin minigame to handle car chases, but I love the idea.
For systems that include a driving skill, you could maybe convert ranks in that driving skill into levels of Charms. Or you could just run the Ghost Kart engine as-is whenever racing happens.
I hadn't heard of Acceleracers before, but it looks rad, and I'd be honored for this game to be used for an Acceleracers campaign.