We were thinking about introducing radio communication to and from trains. However, we haven't done this (yet) as it would not make that much of a difference in terms of the mechanics and the flow of the messaging.
Of course, with radio you can send out emergency broadcasts ("all trains stop!"), and you can listen to communications between other participants, both of which seem to be not so important.
Is that what you're talking about? If not, please enlighten me!
Please be aware, that if we open a separate channel (like radio) for communication, you have a chance to get more than one message at a time. I don't know if that would prevent to drive a "dispatcher more bonkers", so be careful what you wish for ...