Thank you kindly, Mircea Kitsune for a patch that solves:

When the avatar stops flying in mid air, it stays still 
while it falls to the ground. Normally, the avatar would 
use the falling animation (when it spins its arms and legs 
while falling) until it reaches the ground.

1 files changed, 2 insertions, 2 deletions

diff --git a/OpenSim/Region/Environment/Scenes/ScenePresence.cs b/OpenSim/Region/Environment/Scenes/ScenePresence.cs
index 38427cf..3313524 100644
--- a/OpenSim/Region/Environment/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Environment/Scenes/ScenePresence.cs
@@ -1521,7 +1521,7 @@ namespace OpenSim.Region.Environment.Scenes
                         return "CROUCH";
                     }
                 }
-                else if (PhysicsActor != null && !PhysicsActor.IsColliding && PhysicsActor.Velocity.Z < -6)
+                else if (PhysicsActor != null && !PhysicsActor.IsColliding && PhysicsActor.Velocity.Z < -2)
                 {
                     return "FALLDOWN";
                 }
@@ -1542,7 +1542,7 @@ namespace OpenSim.Region.Environment.Scenes
             else
             {
                 // We are not moving
-                if (PhysicsActor != null && !PhysicsActor.IsColliding && PhysicsActor.Velocity.Z < -6 && !PhysicsActor.Flying)
+                if (PhysicsActor != null && !PhysicsActor.IsColliding && PhysicsActor.Velocity.Z < -2 && !PhysicsActor.Flying)
                 {
                     return "FALLDOWN";
                 }