Mechanical power: allow the clutch to be toggled between two parallel transmissions

[hstone32]

Place two transmission parallel to each other, 1 meter apart. Place a clutch between them, and now you can toggle between two channels without having to operate two transmissions.

Came up with this idea while designing a 3 stage transmission for my windmill. Each stage consists of a large gear being fed by a pass-through channel and a upshift channel. As it is currently designed, each stage has 2 operative states, 1 redundant zero state, and 1 error state. This is due to the fact that the transmission is only capable of railing a channel to zero state, so we cannot use only one transmission to switch between two non-zero states (unless they add a comparator to the game, which would allow us to make logic gates).

Anyways, the point is that I don't like how I'm unable to limit the finite states of a system to just the operative states, so I'm requesting this small feature.