More ideas.
Prop Climb - Avoid the floor. Players can spawn as many props as they want to get as high as they can (without prop surfing) within a designated time limit. Mods must pay some attention to who is cheating or legitimately climbing the props. (Someone using a sequence of ladders with stacker tool should be shot by an AWP in the head).
Last Prop Standing - Individuals stack props to the highest possible point but cannot freeze any of them. It must stand along and unaided by outside forces. May be tough to review and challenge. Or make it have to survive from an SBC/Thomas explosion.
Traitor - A group of citizens are brought to sitland. Have Lahey make a beautiful dining hall and each person sits in a chair (or whatever a bunch of spergs with ADHD can manage). Then there is a specific citizen whispered to by the mod. That citizen then, about every 5 minutes or so, can whisper to the Mod to have a citizen killed. The rest of the citizens get one vote every 5 minutes to remove the potential "killer". If they remove the killer, the citizens win. If the killer lasts until the final round (two remaining), they win.
Hungry Hungry Props - Random props (announced via /advert) are placed among a field in Sitland. The player to retrieve (and survive) returning the prop to the safe spot wins a prize. Players are encouraged to betray, murder, and steal.
Stoplight - An open field with players lined up (not possible to achieve, but worth pretending people aren't incapable). The Mod issues a "3" "2" "1" "Move!" ... Players run as fast as they can toward a goal line. Any time the Mod says "1", "2", "3", "Stop!" (with some leniency) players must stop moving. Anyone moving is shot dead. Rinse and repeat until end.
Capture the Ball - A ball is set in the middle of a field. Two teams race to get the ball. Stunsticks can be used to bludgeon people to death to get the ball out of the opposing team's gravgun. Crossing their own base line earns them a point. Highest points win a swift death.
Rapid Build a Picasso - Individuals have their prop limit to construct the Mod's wishes. Best attempt to recreate the image wins a swift death.
Base-ket-ball - Teams take a big ball and run with it aiming to shoot it through an opposing team's hoop. Fists/Stunsticks are allowed to stop a team from attempting. The hoop likely needs constructed so you can only shoot from below the hoop to avoid Kobe shots (not talking about crashing into a mountain).