Not really a bug for me, my Game sets Neutral too when minimizing/Shift+F4 with put in Gear (using manual Clutch)
If the RPM's & Speed match the Current Gear it just plops in (Accelerate & shift up w/o Clutch, just release throttle and gear plops in)
I just had a weird bug on my FZR, i left Pits on AS5 and suddenly my Car started to accelerate itself(it reached more than 80kph with Pitlimiter) i didnt press throttle. I dont know how to Reproduce it.
LFS Version Z15
If needed: Using G25 & had turned on manual Clutch+H-Shifting at this time. Here's a Video http://de.xfire.com/video/121ca2/ (the LFS replay is attached).