I've just noticed that with the poll mod installed, ANYONE can vote, even if they're not logged in. This has the potential to skew the results - is there any way to chnage this so that only those who are logged in can vote?
A member decides who they want to participate in a poll. If you want to limit to who can create a poll, you can edit the forum properties and select between admins, moderators and all members, for the permission to create a poll. This allows you to have control of who creates polls and know they will create members only polls.
Apart from that, you would have to make some code changes to post.asp to remove the option to allow members to set who can vote in their polls.