We already got this in java so I see no reason why this shouldn't be added :)
also why would u need party chat only. U could have both like /p chat and also ! Symbol for global chat. But I dont think that they are taking it seriously.Considering most players on the network don't know how to spell I don't see the party chat feature ever being useful, it would only ever be used in a scenario where you are up against another good team and you just happen to not be in a voice chat with them.
Overall it just makes it more annoying to talk to your opponents. Aswell as call out when a player is hacking. If anything the ! should be used to be able to talk in party chat instead of the opposite way round.