I think it caps at 7. I'm getting "no paths" like a motherfucker now. Even get some that are "no path" one way, but 7 clicks the reverse.
A double "no path" is 10-way to .577 ammunition
Edit: If go to the page that hosts the script that the above page is calling, there's a big explanation on this script. Kinda interesting stuff:
http://www.netsoc.tcd.ie/~mu/wiki/