Yes, you can connect 2 MRCC's together and remotely route outputs!
This feature was added after MRCC started shipping, so it might require a firmware update. Get it from the Download section, or check the forums MRCC Open Beta Firmware section for pre-release firmware and release notes. You must be logged into the forums to see this.
When 2 MRCC's are connected, the Y guy lights up in the top right corner of the screens of both MRCCs.
Route MIDI Outputs on the 2nd MRCC by holding the Remote routing button. It is left of the encoder, and marked with the Y guy. Press and hold the Remote routing button on each MRCC to see what remote outputs are routed from the selected Input port.
Save your settings on each MRCC to save the remote routings you created.
MRCC's are connected using a CAT6a shielded Ethernet cable plugged into the RJ45 on the right side of the MRCC. The best kind of Ethernet cable has metal shrouded connectors that are connected to a drain wire in the cable. We have tested up to 32 feet (10 meters) with a CAT6a cable. You might be able to go longer, maybe up to 50' with a good cable. A regular Ethernet cable might also work for shorter distances, like 6 to 10 feet. YMMV
The MRCC to MRCC electrical connection is not MIDI, but a high speed serial interface. The MRCC to MRCC cable does not factor into the MIDI spec cable length limit of 50 feet. Therefore, you can still use long MIDI cables on each MRCC.