Walk speed is calculated from run speed. There is only 1 speed entered from the database. 
 
EDIT: To be complete, I guess I could answer the other question above. 
 
If you would like to change the walk speed, go to (currently using r1713) mob.h line 596. You will see that GetWalkSpeed() uses a mod of -47 on the runspeed. That is where you would tailor your walkspeed. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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