I've made a vanilla version of EggWars called Potwars (which I am not releasing, do not ask) with only commands. Combat logging as it's called was an issue, but I just made players be kicked from the game and put into the lobby when they have done so. But I have some to say, so hear me out.
You should be able to rejoin games, however your inventory, not armor, should be removed when doing so.
It should exist. I'm not sure if it's Cubecraft or me, but I've been getting lag spikes where I'll be doing just fine in a game, and then everything will freeze and I'll time out. It should exist, but there should be small consequences for logging. Maybe pay a point or two to get back in?