[Plugin: WordPress Navigation List Plugin NAVT] Need to increase (NAVT) link limits

I have just recently added Navigation Tool (NAVT) to a couple of my WordPress sites. I have found that after 319 pages the NAVT plug-in does not work. Is there anyway to increase the number of page (not posts) links it can handle?

http://wordpress.org/extend/plugins/wordpress-navigation-list-plugin-navt/