Another thing that seems to be working for me, and limits the total number of linked pages written the the database is to find the line:
PHP Code:
while($level <= $limit)
(line 250) and change it to
PHP Code:
while($level <= $limit && count($links_found) <= 200)
where 200 is the number of links you want written. The site might stay locked this way, though, and you'd need to move the unlock code (line 588).