The only easy way I can see right now is to duplicate the entire news block (and add 1 query) to get the stickys and then get the news.
Copy the news block of code and paste above the existing news code and change in the new block:
PHP Code:
WHERE forumid = '$newsforum' ORDER BY thread.dateline DESC LIMIT $newsposts
To:
PHP Code:
WHERE forumid = '$newsforum' AND thread.sticky='1' ORDER BY thread.dateline DESC
Untested but should work, note you will get the number of news posts defined plus the number of sticky's in that forum.