[Admin]

In user.php under your admin folder add

PHP Code:

if ($maxposts) {
    $sqlconds .= iif($sqlconds=="","WHERE","AND")." posts > $maxposts";
} 


below

PHP Code:

if ($minposts) {
    $sqlconds .= iif($sqlconds=="","WHERE","AND")." posts < $minposts ";
} 


And add

PHP Code:

makeinputcode("Has more than <i>x</i> posts:","maxposts",iif($maxposts,$maxposts,"")); 


below

PHP Code:

makeinputcode("Has less than <i>x</i> posts:","minposts",iif($minposts,$minposts,"")); 


This should do the work. I would test it, but I have only 1 user at my demo board.

Good luck, and tell me if there are any problems!