The transmission is a sequential but doesn't have auto cut. You need to lift off the throttle to shift up. One thing you could do is basically hold the upshift paddle and then lift off the throttle to engage the next gear.
Downshifts should be easier as the gearbox will be under less load but you can't downshift too fast either.
Interestingly generations of the FBMW that we have does have autocut for upshifts. The one that LFS simulates just has a less technological gearbox in it.