I am going to echo something many have said... Friends Lists! Really would be good to have teams of players who know each other well... I enjoy playing with randoms, but get far too many hackers!
Another fun feature I think would be (Mainly PC based I think) Voice Chat during meetings... Make it more like the Among Us Toons that have been released - Also makes the Meetings more chaotic!
It would also help discourage the Teamsters using Discord... Wont stop them but will discourage as players will be able to inform one another faster when they are clearly being screwed over!