Add "Abstain" to voting options instead of just up or down
Give users the ability to 'abstain' from voting on a particular idea but still show the idea as voted on.
With the vast number of ideas I try to not re-read them, but if there are some that I don't feel strongly about either way I won't vote. Then they still show the vote up or vote down buttons. If there was an option to abstain (think mark as read) that would help me manage Ideascale as a user.