Killzone Kid is on the right path here.
Dev team should just move the extended "flyInHeight" command from VBS2 to ARMA.
Syntax: object flyInHeight [altitude,mode];
object: Object - Aircraft altitude: Number - Flying altitude in meters. mode: String - "ASL": altitude above sea level, "AGL": above ground level.
Return Value: Nothing
Example: _AiPlane flyInHeight [100,"ASL"];
Using current method gives me a bad headache and sometimes epileptic seizure (try on Stratis).