Going by the Nyko Game Console (which features a near-identical game list save for the Adventure Island hack), a number of other games in the 300-in-1 are also undumped. I imagine it'd be easier to dump from the Toyota cartridge rather than the Nyko's built-in ROM, so I think it's definitely worth dumping (though I wouldn't be able to acquire it myself). I assume you're already aware, but there's also a much more limited McDonald's version with different software.