If Wakerider is using natural weapons to grapple, the damage should be lethal unless he deliberately takes -4 to make it non-lethal. This situation occurs regardless if Wakerider has improved grab or not. This is the reverse of humanoids that rely on their unarmed strike to grapple - the amount of damage is the same, but the type of damage is reversed.
				
			 
				 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		