From the old days when review votes were vote-only with no comment, the "revoke" action takes only a single click. This is quite unfortunate with the new comment system where an accidental click can remove the whole comment.
So my feature request is simple: confirmation on "revoke vote" for reviews.
@Rar: actually it's even easier to "misclick" when you select links with the up/down keys and meant to read your existing comment rather than revoking it.. (or just accidentally hit right arrow instead of up/down). But I figured it would make more sense to most users if I just kept it simple and said "click". *sigh*