I believe you can do that in the Admin tool under the Zones tab if you are running your own server. Correct me if I am wrong, haven't messed with Admin tool since it was version 2.6, which is now running at 2.8 :p I do remember making it so any lvl could go into planes, I went in the zone tab, under min level i deleted the 46 and changed it to 1. But never did try doing max level.... 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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