Problem/Annoyance
This is a pretty small suggestion, but I think it is pretty important. So, in most games, you are not allowed to chat until the game starts. I think this is so people don't beg for Overpowered and other settings, and there probably are other reasons. I think that in games like Team Skywars and Team Eggwars, you should be able to talk to your team before the game starts. When I am playing Eggwars, I always get iron for blocks right away then rush to the middle, without getting any armor, to be the first person in the game to the middle. I like to be able to tell my team that I am going to do that, so not everyone goes to an iron generator leaving me to sit and wait. The beginnings of games are a very important part. It is good for the whole team to have a plan before everyone drops out of their little glass boxes.
Solutions
There are two ways to make talking to your team before the game possible. One way is to make Team Chat allowed before you drop from your glass box, another, possibly more complicated way is to enable team chat in the lobby. I know you can talk to your team in the lobby, but you don't want to scream your game plan out to everyone else. The problem I see with this solution is that people can join a team just to hear their plan, and then go to a different team. Any ideas?