Thanks @brandock and all credit to @Robert.Wall for highlighting that we should make this a clear shop option and also doing the hard work to support the N. American split phase configuration in the emonLibDB library!
Reading your useful thread, this is exactly what we are offering with the N. American configuration, a 3-phase emonVs and firmware pre-uploaded to use 2 out of the 3 voltage sensors (the technical user configuration as you describe it):
Edit: removed bit about correction, I misread 
I was planning on starting a thread about this as one thing we haven’t settled on yet is what should the standard CT sensor to voltage sensor allocation be? can there be a standard allocation or will it always end up needing an installation specific configuration?
Do we standardise on a couple of 240V line-line loads and the rest being single phase alternately allocated to leg 1 and leg 2?