To help better utilize the 8 available midi commands you can send out at once, it would be nice if you could consolidate commands.
Specifically, a PC dual message, where N1, N2 = program change number and V1, V2 = Midi channel. So if N1 = 4, V1 = 1 and N2 = 8, V2 = 2, you would send program change # 4 to midi channel 1, and program change # 8 to midi channel 2.
So if you had set up a switch to turn on all presets associated with a song verse, you could use the PC dual message as one message instead of the current set up, where you have to send two separate messages to achieve this.
This is similar to another user's request for sending out a "Combo" message as one MIDI message. But I only suggest this in case this one is more easily writable to the MC6's architecture.