Found a solution to avoid having to install MOOSE.

Now MOOSE can be copied into the mission file, but you'll need to
include a "do file" action of moose.lua in the mission file and copy the
rest of the MOOSE files to the MIZ file.

Moose/NoTask.lua

@@ -0,0 +1,28 @@
+--- A NOTASK is a dummy activity... But it will show a Mission Briefing...
+-- @classmod NOTASK
+
+Include.File("Task")
+
+--- Modeling a sequence of STAGEs to do nothing, but wait for the mission goal.
+NOTASK = {
+  ClassName = "NOTASK",
+}
+
+--- Creates a new NOTASK.
+function NOTASK:New()
+trace.f(self.ClassName)
+
+  -- Child holds the inherited instance of the PICKUPTASK Class to the BASE class.
+  local Child = BASE:Inherit( self, TASK:New() )
+
+  local Valid = true
+
+  if  Valid then
+    Child.Name = 'Nothing'
+    Child.TaskBriefing = "Task: Execute your mission."
+    Child.Stages = { STAGEBRIEF:New(), STAGESTART:New(), STAGEDONE:New() }
+	Child.SetStage( Child, 1 )
+  end
+  
+  return Child
+end