Advanced team commands were recently added, so the next mod contest will be to make a teamwork-oriented challenge.
The challenge should require the player to either switch control to different teammates, or to use the new team commands to accomplish an objective.
The easiest way to require teamwork is with puzzles, like Lost Vikings for the SNES, making one teammate stand on a pressure plate, etc. You could also make it combat-oriented, but make sure it's not doable with just a single character. Maybe you have to order one character guard something while another explores?
In other words, try not to imitate the OG Rainbow Six, where you could go in with one guy and shoot everyone in the head if you want, completely ignoring your team making hand signals for unknown reasons.
Deadline is October 20th, first place prize is $60.
Smashzone is out this time because he's working on For Want of a Pack of Smokes. I repeat: Smashzone will not be participating. That means you could send in some schlock and if yours is the only entry and it requires teamwork, you get $60. Runner ups will get Steam keys (at the least).

Here's a video of the F1 GUI world editor, because I noticed all the videos so far were of the F2 command prompt editor.