prioritizing urls and changing the re-fetch interval

[John Martyniak]

I would like to find out if there is anyway in either 0.9 or 1.0  
change the priority of URLS that need to be fetched.  And on the same  
note to change the re-fetch interval.

I thought that it could be done by re-injecting the URL that you would  
like to re-fetch.  But I had read recently that if a injected URL  
already exists in the DB, then it is ignored.

Thanks in advance for any suggestions.

-John