Here's a device I made specifically for a minigames-type world. It's a highly configurable capture-the-point system with an option for a king-of-the-hill mode.
Standing on a pressure plate will change the beacon to that colour. If king-of-the-hill is enabled, more lamps will turn on of the side you're on for as long as the point is in your team's control.
The mechanism is pretty simple: standing on a pressure plate activates an observer clock that puts items out of one dropper and into the other. If enough items are in one dropper versus the other, a glass block is put over the beacon and hopper clocks are unlocked. These hopper clocks are for king-of-the-hill, and if you don't want that, they're entirely optional.
I think it's pretty useful. It's small, and you can configure how quickly the point captures by how many and what type of items you put in the droppers (If you want it to go super quick, you can use non-stackable items, if you want it to go super slow, use only items that stack to 64, etc.).