Changing the amount of players out-game

[Lon-ami]

I have seen a DotA where the player amount appears to be...

2560!

How the hell have they done these?

Thanks.

PS: I don't mean playable slots, I mean the player number appearing left of the map name.

 

[Lon-ami]

I'll try to put a screenshot soon, I hope someone anwers me...

T_T-