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While there's no stock way to do it as far as 0.20.1, there's a fan-made plugin that implements that functionality and more:

http://forum.kerbalspaceprogram.com/showthread.php/24636-0-20-Kerbal-Crew-Manifest-v0-5-3-0-Released!-Create-Edit-Remove-Kerbals

It also lets you pre-populate the Hitchhiker pods when you launch them, if you so desire.

Edit: still true as of 0.24