Good day to you!
I was wondering if Blizz would implement such option. As for me (and I realise that to many other classes too) it would be a great option. I'm playing as a tank in raids, and have 2nd spec as a tank for BG. Sometimes it's necessary to switch to DPS in certain situations but I simply can't! I know it would be also very helpful for a paly, druid, shaman, and many other classes (propably to all classes). Such change would rise playability of class, and maybe more people would focus on their mains.
Vote please and have a nice day!