Thank you kindly, Nlin for a patch that:

Attached patch adds detection of AGENT_WALKING 
status to LSL function llGetAgentInfo() 

1 files changed, 6 insertions, 0 deletions

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 4c4d173..9745ae6 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -4671,6 +4671,12 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                 flags |= ScriptBaseClass.AGENT_TYPING;
             }
 
+            string agentMovementAnimation = agent.GetMovementAnimation();
+            if (agentMovementAnimation == "WALK" || agentMovementAnimation == "CROUCHWALK")  
+            {
+                flags |= ScriptBaseClass.AGENT_WALKING;
+            }
+
             //NotImplemented("llGetAgentInfo");
 
             return flags;