I have an idea so we can make our own gamemodes and play in that gamemode in multiplayer.If u want play to your (or others's)gamemode just type: (name)-gm-(name,only letters)
For test this gamemode just click "play as tester" and all players (except bots,you can change what bots must do) will be controlled by computer (if this gamemode need at least 2 players).