It's cool, now people can play with anyone they want!
Gonna be so pro playing with Taiwanese people.
Though remember, different people have reserved region codes here:
Custom Track Distribution - Custom Mario Kart
Don't use one of these, especially any reserved for CTGP.
If you want one for super cool region with your buddies, just make one up that's not reserved (we should reserve a region just for people that want to use a custom region).