The only feature that I can see beneficial to add to polls is a vote confirmation, though I haven't used a phpbb one in a while so I'm not sure if that already exists - I was thinking about this idea and about canceling a vote for a short time in case of error, but the results could be skewed by others just canceling and then voting with the majority. So, I don't see this as a very good feature.
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You could always have an option of something like "No idea", "N/A"
David Remember: You only know what you know and - you don't know what you don't know! My CDB Contributions | How to install an extension I will not be accepting translations for any of my extensions in Github - please post any translations in the appropriate topic. No support requests via PM or email as they will be ignored