The category is multiplayer, no need to remove the scanner.

Another question: Is communication with teammates allowed externally or only through voice in the game?

For example, if I find a piece but my ally is on the other side of the map, transmitting that information would make a difference

I like option 2 to simplify the number of categories, but option 3 is ok too!

Since this is a group game, I suggest a team category. I think it would be cool to see the best team where allies need to have synergy in the division of tasks.

The number of tasks is 8, with default values. The number of players is a maximum of 8, but a group can try to perform with less if they want.