Right now, that feature isn’t available within Trello. I’ll definitely file this as a feature request.
If you're curious about how our team decides on what requests we work on, this article gives some insight into that process: http://help.trello.com/article/724-submitting-feature-requests-for-trello. We've also published a blog post with more detailed and visual information here: https://blog.trello.com/feature-requests-unite-support-and-product
If you'd like to see our latest features and releases you can take a look at our dev board at http://www.trello.com/dev. Our mobile boards are available at https://trello.com/b/5tj4qAvo/trello-ios-app and https://trello.com/b/ud59t1fL/trello-android-app.
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