Re: pre-ringworld construct save
			 
             
			
		
		
		
		freaky, are they breeding?  if so, you could drop colonists on a world in a threatned sector, and then come by and colonize it when it is safe from hostile action and the population has grown to a respectable level. 
		
	
		
		
		
		
		
		
			
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				...the green, sticky spawn of the stars 
(with apologies to H.P.L.)
			 
		
		
		
		
		
		
	
		
		
	
	
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