Marta here, from Trello Support.
Right now, that feature isn’t available within Trello. I’ll pass your interest in this on to our team for consideration—please let me know if there's any additional info you'd like for me to send their way.
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
Also, to see what features our devs are currently working on, you can check out our dev board at http://www.trello.com/dev.
Atlassian Summit is an excellent opportunity for in-person support, training, and networking.Learn more
A blank Trello board can be both a beautiful and intimidating thing. How many lists should I have? Is creating 10 labels overkill? How can I best track my progress? Is there a way...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs