That is very, very close, but it won't quite do it. In the code, polls are sorted by DESC, so you would get the same darn poll even if you specified several.
1. in currentpoll.php replace that line (around line #22)
2. Now in your CMPS defaults screen, you can use a list of poll ids in place of the line that formerly held the poll forum ID. Separate them with a single comma and no spaces. Order doesn't matter. For example.
### MEC REPLACE $query['pollquery'] = 'AND forumid IN(' . $vba_options['portal_poll_forumid'] . ') ORDER BY poll.pollid DESC';
$query['pollquery'] = 'AND poll.pollid IN(' . $vba_options['portal_poll_forumid'] . ') ORDER BY RAND()';
To get the poll id numbers you can hover over the Edit Poll link on your forum and it will show in the navbar.