in this next patch, theres 2 kinds of sequentials:
the FBMW (henceforth, Formula beemer->FeeBeemer) has a non throttle cut sequential, meaning you either lift of the gas to shift up, OR use the clutch and lift (though you can choose not to lift, but will eat up the clutch).
The others (FOX, FB8, FXR, XRR) have a throttle-cut sequential - very much like the current roadcar semi-automatic gearboxes found in the newer cars (like the flappy-paddle citroen c4 picasso, the smart fortwo, and on the other end of the spectrum, the flappy paddles of the maserati, F430 and astons.). These work via a "robot" that engages the clutch, and then changes gears for you. It can range from downright retarded (like in the Smart) or uber highspeed (like in the F430)
In these robotic semi-autos there is no clutch pedal. I believe LFS simulates this kind of tranny, as a regular full auto (torque-converter auto) would be ripped apart by the most powerfull engines. Additionally, these trannys ALSO cut your throttle, so you can keep your foot on the gas to shift up. They do NOT blip on downshift (as in regular driving it would be needed all the time, and "wastes" fuel) but they DO cut. Infact, in most, if you lift off the throttle on upshift it gets confused and leads to quite a jerky shift. (basically, a computer reads how much throttle your putting, and decides to shift quickly or more slowly depending on how much you are throttling (is that a word?). If you lift mid-way through the shift it tries to slow down the shift to match a less sporty driving style.
I have no idea if the Febemer has a clutch pedal IRL, but since you can put in LFS settings "shifter" type transmission and manual clutch and STILL shift without using the clutch pedal, methinks it doesnt, and has a robotic-style semi-auto that has no upshiftcut (and for safety doesnt change up if your on the throttle).