Here’s some info on the trim pause-bug . Holding down a button for trim up/down will first send a single trim-pulse , and then pause for 0.5 seconds, and after that send continuous trim pulses at a high rate, while in the real world the trim output would be continuous as long as the switch is being held down. The same weird behavior goes for flight controls and throttle . First single pulse, then 0.5 s pause, then continuous output at high rate.
Note that the post below also discusses the acceleration , but I think the 3 different speed levels have been removed now. But that was just half the problem, the pause behavior is still present since release.