There was a list with useful commands for dota 2, though its completely outdated and so many things changed in the game. So I just wanna start this thread so everyone can post the console/startup commands they are using for dota 2 right now.
e.g. with the addition of the "card"-design in the pickscreen there were some commands to start the game with the grid-design and customize it the way you want.
I'll update this post with all commands posted in this thread.