Help with Polls

[s99sdp]

Absolute novice here so cut me some slack!

I want to add a poll to a site I'm working on. Basically I may want people to vote on stuff that could happen in the future
I've worked out how to add a poll in a thread, but I don't want anyone to be able to comment on it, just take part in the poll.

Is that possible?
The reason I ask is that the only two options i see when I try to set it up is to close the thread after I set it up which then basically stops the poll from being shown

OR

To leave the thread open and then in turn this allows people to comment.

Sorry if this is a stupid comment. Sorry if i'm missing something really obvious. I'm new to the software and just working my way round it so any help would be greatly appreciated.

SP