flexible gerylisting delay based on dnsbl score

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What would you like to be done?
It be helpful to be able to dynamically set the greylisting delay based on 
the dnsbl score.

I have two possibilities in mind:

1.
There should be a default delay configured in grossd.conf and an additional 
dnsbl_score_increment_delay which gets added for each weighted score 
obtained from the dnsbl lookups.

or

2.
There should be an additional optional delay parameter to be set for each 
dnslb (just like the weight)

Original issue reported on code.google.com by [e-mail] on 4 Feb 2010 at 10:55