Travis,
it seems like you enjoy fighting people every step of the way.
I'm not fighting with you, I'm simply attempting to help you reset your expectations appropriately. I'm as close, or closer, to Dave's efforts as anyone not working for Dave or MTH.
I am a network guy by day
Without getting into it, I can assure you that my IT credentials (both education and career) would give you a real feeling of confidence that I know what I'm talking about. While I'm certain that you certainly know your networks, what you most likely lack is the detail knowledge of Dave's application.
Putting on an external wifi antenna is a lot easier then screwing with the TIU,
That would be great, except you mentioned "using smartphones over WiFi to a wired connection to the dcs". That would require running a cable from the TIU to either an access point or to a wireless router. That's exactly how I have Dave's current system connected for Wi-Fi access.
The reason I went with wired Ethernet was price. Dave's wired ProtoNet boxes are $85-95 each. You'd need one for each TIU (I have 3) and one more for either TMCC or Legacy.
To connect each of my 4 devices (TIUs and command base) wirelessly instead of via Cat6, would have been about $230 each.
Now, when MTH manufactures a Wi-Fi add-on for the TIU, it may be a lot less expensive. However, we have no guarantee when, or even if, that will happen, and if so what it will cost. Further, it might only have an internal Wi-Fi antenna and not have the capability for adding an external antenna to extend that internal antenna. We just don't know.
My intention is to curb your enthusiasm a bit, since you don't have all of the facts regarding Dave's app or the associated hardware requirements, and that at this time there aren't an abundance of facts to be had, either.