What was the command to make AI pilot to but Landing Gear down,?
As Epeli said, use the action command "LAND GEAR", but I only managed to get this working for the AI, when the aircraft was stationary and on the ground.
How I can command AI pilot to but engine off.
Use the action commands "ENGINE OFF" & "ENGINE ON". But this only works for AI on Islands that dont have Taxiways defined in the config, the Desert Island for example.
When landing, I thought about using small velocity script, but is there anybetter ways?
Use the action commands "LAND" & "CANCEL LAND", these work fine for the AI on OFP's main runway
The rest depends on the addon your using. But your own velocity script will also work