Simply allow an understrengthed race to summon some a very nasty pet with AoE. That would be a great equalizer. 
 
As for the swamp wars idea = great, but... 
 
If it is a slow grind to level to a reasonable PvP level = bad. Try the Guild Wars approach - low level cap, High EXP rate. That allows peeps to jump on, pick a side - level up and join the fray before they lose interest. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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