I'm one of the biggest TOs in my country, and I main Mii Brawler since Nov. of last year and this is my stance:
Miis should be allowed to use their different move set ups - mostly because the game allows you to use their different setups with "Customs Off" and creating or editing the miis moveset is much quicker than editing your controller map layout. If this was the case, we should all be using DEFAULT CONTROLLER SETUP.
I strongly oppose being able to change the Miis height/weight. These should be the normal default height/weight miis and I oppose basically because of time constraints. Being a TO I know how hard it is to keep the schedule going on track, and importing miis or changing their height/weight really does take a lot of time due to Smash's ridiculous loading times. Me - nor anyone down in Panama - or pretty much down in latinoamerica in general has any problem with the usage of Miis in default size (Guest Miis are right there - just choose one and change their moves). I even have my favorite Guest Mii that I always choose and use (the blonde girl) and I just look at it as if the different guests were other attires I could use for my Mii Brawler. I don't change the clothes or anything, just use the Guest Mii and change their moveset (though, sometimes I might add the cat ears for flavor
).
Honestly, this is the way the ruleset should go. Guest Miis, any moveset. Most competitive Mii mains will use the same moveset anyways so there is no reason why you shouldn't be able to practice the MU anyways if you have Guest Miis in your wii system.
Plus I strongly agree with the fact that in the ruleset it should say: "Customs Off - anything you can do as long as Customs Off is not considered custom."
:D
Just my two cents. USA is looking like it's going to be the only country in the whole world who is going to be banning Miis still - I'm seeing that everywhere else there is no problem.