TSG S06a Can recruit mermen

I never understood the purpose of mermen. All they do is change what the Naga Queen has to say. Let's let Sir Gerrick recruit them here. It's really just about the only place in the entire campaign where they actually can do some good! Why limit him to just those Deoran had?

data/campaigns/The_South_Guard/scenarios/06a_Tidings_Good_and_Ill.cfg

@@ -166,6 +166,19 @@
             recruit=Elvish Fighter,Elvish Shaman
         [/set_recruit]
 
+        [if]
+            [variable]
+                name=has_mermen
+                equals="yes"
+            [/variable]
+            [then]
+                [allow_recruit]
+                    side=1
+                    type=Merman Hunter
+                [/allow_recruit]
+            [/then]
+        [/if]
+
         [unit]
             type=Elvish Ranger
             id=Eliomir