Is there any way to turn off random worm placement. I want the players to be able to choose where their worms should be placed at the beginning of the round. This is possible in Worms3D.

There isn't a teleport in W4:M, so it isn't possible.

Indeed. I did not notice this, as I did not use the teleport in my weapon schemes in W3D.

It was never fully implemented but was planned, if you take the first demo and have a look in the save file under the demo scheme and look for WormPlacement or something like that you can see it was planned as an option, but if you change it to 1 nothing happens. :(