Should the gameboy advance varient of HWWR be on the leaderboards? And if so in Misc.?

I've never played it. Based on videos of the game, I think it should be a different category, or a new game on the website. It's completely a different game, from the cars you start with, to how the game plays. I opt towards a new game personally, but we can put it as a different category (likely a Misc) if we don't see the need to do so.

Yeah it would need to be a completely different game

True, that's what I was thinking myself.