I would think that this would be outside Realm Works' purview, as most "real time" stuff would be the function of whatever RTT software you were integrating Realm Works with.
In any case, when my players have tablets/phones at the table, I just use Skype.
So a feature like that in Realm Works might be nice, but would ultimately be redundant.
Now what would be REALLY nice is a customized reveal to, say, show a snippet to Player 1 while still hiding it from Player 2. But that would probably require extensive rewriting of the code, given the way it's currently designed, and even I have to admit that the work would not be worth the reward, since it's fairly rare to need that kind of tweaking.