We all know that you MUST execute the actions you reveal on your command dial: March, shift, attack, etc. Reform is interesting because your unit doesn't move much at all. One thing I've seen a lot is people waiting to see their opponent's moves by dialing in a Reform, wiggling the unit back and forth a bit, and then more or less leaving the unit the way it was originally oriented. I don't have a problem with this. Sure, it can be perceived as gaming the system a bit, but you can literally rotate less than a millimeter, and it's still legal.
Here's the question: if you are engaged and dial in a reform, are you required to change your orientation? I'm thinking the answer is "yes." If you don't rotate around your center or the center of one of your trays, then you really haven't performed a reform. Do you agree with my interpretation?
(P.S. This came to my mind as I looked at the Wraiths dial again. Sure, you can dial in the yellow melee and use a morale modifier at initiative 4, but if you aren't sure if you're going to be flanked or not, it's almost always better to dial in reform + melee so you can be sure to get your full threat. If you guess wrong, and they don't flank you, though, I think you're stuck reforming away from optimal alignment, and put yourself in a bad position. Unless I'm wrong.)