I am pretty sure mods are not allowed. As far as I know, there has been no official talk within the community regarding mods, but usually most speed running communities ban them. I would expect expect the same with us, and I would vote to ban them.

Yes there is a way, you manually go into the games files and delete the data that holds your save files, but this causes you to lose all of your save data. So when you reopen the game you have to go through the tutorial again, thus making it slower.

I am unclear about this too, but guess that it would be getting 4 10/10's