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loginGoedendag also has knockdown, 
is not unbalanced, 
+25 length, 
+6 damage on thrust - 
pierce too. Also I believe it uses the 
2h stab animations... (not 100% sure there)
Studded warclub has 
+4 swing damage, 
+.3 weight (affects knockdown %) and can
 knockdown on thrusts...but its rare due to damage threshold required vs. the awful thrust damage, and it uses the 
polearm thrust.
Also from a realism point of view - 10 small metal studs spread along the length of a wooden weapon would unbalance it less than a solid metal cap on the tip of a longer one. Center of gravity etc.
Thoughts?