This sounds like an interesting potential feature.
I assume that you want TCP over ethernet and not TCP over RS232.
Conceptually, we could have a module that fits on the controller's main board with an MCU & ethernet connectivity. This would not be a trivial development, however. Furthermore, the module would take the place of the optional Optical Encoder, which many people would not want to lose.
If you forsee reasonable quanties, please contact me directly to discuss offline