It is on the list of things to look at. The main problem is PF3 does not control AI traffic, that is down solely by FS so we really have no way of knowing what other traffic is doing other than which 'mode' it's in i.e. taxiing, taking off, landing, etc, etc. Yes we can tell if the aircraft is turning, climbing or descending and all this information is used to provide our normal chatter, but trying to emulate Unicom/Multicom chatter is much more difficult. There is no way of knowing if an aircraft is turning to base for instance or flying downwind or VFR or IFR... certainly not without lot of monitoring/processing.
I'm not saying it's impossible but it is a much bigger task than you might think.