RBLS and Hangup

[LuKreme]

After reading (and implementing) http://www.postfix.org/STRESS_README.html#hangup 
 I was wondering if there is any reason not to extend this behavior  
to 127.0.0.4-8 (the XBL)?

Also, why would I want:
8 rbl_reply_maps = ${stress?hash:/etc/postfix/rbl_reply_maps}

Is there a reason I would only want to hangup on the RBL listed  
connections when the server is stressed instead of all the time?

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