Not Mike, but
YES!
The SE gearboxes are essentially the same
MANUAL gearboxes as the SM gearboxes, only the SE's have some sexy 'electronic shifting' gear
added, and they use a Centrifugal clutch (SE5) or an Oil Pressure driven Hydraulic clutch (SE6) instead of the lever operated jobbie the SM's get. But everything else is the same - so the SE's are MANUAL gearboxes that have the addition of some computer controlled and electrically operated solenoids to actually shift the gears in micro-seconds as and when prompted by the ryder operating the flappy paddle thingies up on the left hand Handgrip. And that shaft is simply where the SM gearboxes would have a shift lever fitted to allow the operator to select & change gears.
The SE's have those added electronic shifting bits, so the ryder doesn't
need to use the foot lever, but they
CAN if they wish/need to, and there are even a few owners who have fitted a shift lever onto that shaft so that they can use the alternative shifting facility it provides. And if your Gear Position Sensor fails, or something inside jams the gearbox in a gear, you can usually grab that lever with a set of multi-grips or pump pliers & twist it to manually select Neutral (or another gear) that way!
Just don't try to ryde your Spyder while selecting gears with pump pliers, it's a bit difficult to reach under the Spyder while you're moving and the Authorities seem to take a dim view of it?!