I could swear I had another suggestion...
Ironsight on right click hold:
When we want to enable ironsight, we only need to click the right mouse button once and it'll lock on that mode. That might be disorienting sometimes, because the screen has a lot of action and sometimes your brain can't process if you're in the normal stance or in the ironsight stance. So my suggestion is to enable the ironsigh only while you're holding the right mouse button down. That way you just need to release it to disable that stance.
Spades VS Aces:
New gamemode! Woohoo! It's a very complicated game, but here we go: Everyone starts as Aces. They have about 10 minutes to build a fort. After that, someone dies randomly. He has now become a Spade. As a Spade, your objective is to kill Aces. Every time an Ace dies, he becomes a Spade. Therefore, at the end of the game, there will be no Aces anymore. And that's when the game ends.