To send two channels… well it can't since it only has 1 ADAT port
Just to set things straight, and probably covering things everybody knows:
A normal ADAT at 48K will send 8 channels. At 96K, it becomes S-MUX, and only sends 4 channels. Since each of these is split across 2 ADAT "channels", it is hard to pick them out.
ADAT is becoming more and more obsolete as time goes on, so we don't have plans to add more.