Ability to load blacklist from local filesystem

The IP blacklist appears to only be able to submitted using remote URL's. Some ISP's block server access to remote websites, and hence it is not possible to download remote blacklists - this is done as a protective measure to prevent cross site scripting attacks.

Would it be possible to enable uploads from the local server filesystem? e.g. by specifiying something like /public_html/blacklist.txt etc? Alternatively, could we have a textarea form to cut and paste the blacklist into?