We have everything on ArtNet and as you might know, ArtNet is Base0. To make things congruent, it would be nice if you would have a setup-setting that enables the zeroth universe and also a setting that defines the default universe (so address 121 equals to 1/121 if 1 is set as the default).
We currently have ArtNet universe 0 on Eos 9/xxx where our system devices are (dimmers that turn on audio amping power, worklight etc…) and thats /OK/ but not perfect.
A simple implementation hack could be to allow the syntax 0/… and have 0/… = 63999/…