What if we create a category where you have to collect 10 coins as fast as possible in each track, and cup. Timer starts when you clock start race/trial and ends when you collect your tenth coin.

Cool idea, it'll become more on execution than strats fast but I'd like to see it.

I want to see this be a reality, and if it is, it will probably be my primary category.

adding to that, maybe every unique coin on a track

That sounds awesome! Can we get a mod in here?

I think this would be best discussed at the forum for category extensions: https://www.speedrun.com/mk8dxce