An In Game Chatroom very general idea, which can be implemented in some different ways.
1. A general Chat for everyone in a radius of 50nm
This one would be useful in case you’re looking for an escort or a partner to refuel.
2. An individual chat which shows up as an own frequency
This one would be great for coordinating events, like refueling. The normal ATC is not capable of doing this.
Such a chat could be implemented in vocal form or in written form. It would basically be like a „On Guard Frequency“ as we know it in real life.
I know I listet two points, but I‘m still only suggesting one single feature. An In Game chat would create the ability for pilots to communicate with each other. And I think it has to be implemented in different kind of versions, to be as effective as it could be.
//edit: I know, there are similar suggestions. However, they were written before Global and before we were able to refuel. A lot of things changed.