I really don't think it will give you any additional power transfer, because all the force (well, disregarding flex, which also takes place on the drive side) from your non-drive side pedaling is transferred to the exact same place as the force from your drive-side pedaling because the crankarms are rigidly attached to eachother. I'd imagine that by doing this, you'd only be adding complexity, weight, and a little bit more drivetrain friction.