the wordpress plugin possibilitys

The plugin does its feeding and posting
but i am not sure if the cron works right..
uses:

Cron /usr/bin/curl http://allvetaren.se/wp-content/update-feeds.php -sS -d update=quiet -d log=admin -d pwd=admin

and gets an email with this:

Cron /usr/bin/curl http://allvetaren.se/wp-content/update-feeds.php -sS -d update=quiet -d log=***** -d pwd=*********

curl: (52) Empty reply from server

>> does that mean that no feed was pulled from the rss-sources?

>> can one limit how many posts to post to the blog?

>> can one decide the look for the output of the rss-feed?

>> can one decide how many lines to output to the blog?

regards..