For example, I want to be able to make short notes on other player and see them in game. Or there would be useful to mark player as lagger and see his lagger-rating.
In order to be able to implement such things we need to allow mods to send and receive messages via GPGNet. I checked code of ICE adapter and it seems it is not very hard to implement message routing for interop with external services.
So the question: why nobody implemented it? Is it prohibited by something or what?

Thank you for info, seems reasonable. So, no easy way. But what about chat? Can we create something like chat bot? At least in lobby.

For example, I want to be able to make short notes on other player and see them in game. Or there would be useful to mark player as lagger and see his lagger-rating.
In order to be able to implement such things we need to allow mods to send and receive messages via GPGNet. I checked code of ICE adapter and it seems it is not very hard to implement message routing for interop with external services.
So the question: why nobody implemented it? Is it prohibited by something or what?