Ashley How about giving a periodic heads-up on the release notes or in a blog post that you're going to be reviewing suggestions soon "so update your votes", with links to the site and guidelines. That way you're more likely to capture new voters and encourage existing voters to update their selections, and you're less likely to focus on building features that have fallen out of vogue.
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#5 is something we've never been able to do without hacky blend modes with masks.
It's something that I've needed to do several times.
It's like the undo button.