The ability to send OSC messages.
Sending/receiving OSC message would allow for control of a much broader range of devices, such as triggering lighting/lighting cues, starting recording in DAW software, among others, as well as numerous user designed devices that do not have MIDI.
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Josh Newman commented
I think this title could be updated to better describe what we're looking for, for example, "Add Open Sound Control (OSC) capability to control signals for Lighting control and other devices"
In addition to the above, OSC gives the capability of controlling fader levels, so you could potentially have Hue-style RGB (and RGBW) color matched backgrounds on a wide range of lighting devices. The DMX control software QLC+, for example, supports OSC in this manner.