Have decided to do some more work on the field node this morning. I have added a wireless access point to the system, starting with a cheap one just to see how things pan out. The access point would allow users without their own radios to visit a tower location and play around on the network using just a smartphone or laptop.
Second thing that we are toying with is the idea of a network contained IP phone system using Asterisk. Such a system would allow local events and groups in town to connect up (after registering with our PBX) and make calls between members or locations for free, as long as they are in range of our network resources. The only thing that is required is a network connection and some form of supported SIP software on an android phone or laptop.