It would defeat the purpose. Although I am using a Poll template, this is intended to be a petition, not a poll.
Therefore, by voting for one or the other you are petitioning for the the feature to be included.
Having a 'none of the above' would be petitioning for nothing. And would therefore be useless.
If I did intend for this to be a poll, then I would have added a 'none of the above' however it is not a poll.
Except that they're not going to look at a single forum post which allows for 0 opposition.
If this gets 10,000 people for it, that'd be amazing. But if there's no option BUT to vote for it, the number is much less impressive. How people don't want it? Could be twice as many as are for it. If you have any intention of this being a real petition, you have to allow for opposition.
The reason that political petitions don't allow for opposition is as follows: Petitions are the first step in the public political process. They can be debated publicly later. Video games don't work the same way. A thread that garners support is the FIRST AND LAST chance of players to add in their opinion.
Now, if you're deliberately ignoring opposition to improve the standing of your own opinion, then more power to you. In the interest of fairness, though, I really would like a 'none of these' option.