Im not really certain what all the fuss is about. 
Your shiny new winch up front is just a glorified starter motor.
The factory cable from main battery to the +ve terminal on OEM starter motor is adequately sized for majority of winching application. 
Ensure good clean terminations from starter to winch solenoids and it will be fine.
The +ve terminal on the starter isnt going to care that it has a few hundred amps at it when winch is powering and it wont start a fire unless you poorly junction on the post... which is no different to poorly running a brand new cable all the way to a poorly grommited entrace or a poorly terminated battery connection.  If you are worried about a fire then get someone who knows what they are doing to do it.
IF you want to be able to disconnect power from the winch then it may indeed be more simple to run a cable to the battery box. Then in place of any fancy arse switch just leave the +ve lead off the battery until needed. 
Steve
				
			 
			
		 
			
				
			
			
				'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
			
			
		 
	
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