Flight Idle Gate seems to use GEAR IS ON GROUND to determine if the aircraft is in contact with the ground, but with this, it seems that the reverser cannot be used until the nose gear touches the ground during landing.
If you watch a video of an actual airplane landing, it looks like the reverser is being used from the moment the main gear touches down.
I’m guessing from a YouTube video, so I might be wrong.
If you use GEAR IS ON GROUND:0, GEAR IS ON GROUND:1, or GEAR IS ON GROUND:2 as a condition, you can judge the ground contact of each gear, so I think it can be improved by changing the conditional statement.