Maybe I don't understand what you want to do. When you shift the octave on the right side, both the Main and the Layer voices are shifted. By using either the Main or the Layer on, say, Piano, you could also set Piano voice to Left, and have different octaves assigned. This would let you play piano with both hands, but different octaves.
Or you could use Full keyboard Mode and have one or two voices across the entire keyboard. Chords will only change when you hit at least 3 notes at the same time.
There are many options, but the fact is you only have one manual.
DonM
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DonM