different urlfilters per crawl

[Brian Whitman]

We're running a few crawlers in parallel (different seed lists & topN  
parameters, using different crawl dirs) and we'd like to set the  
regex-urlfilter separate per fetch/seed list. As of now the urlfilter  
is global per access of bin/nutch. Is there anything you can besides  
making two instances of the nutch dir structure?