On a side note, I'll also say that a favorite trick of one of my first characters -Warlord MC Wizard- was to use Time Stop and then commander's strike 3 times. TS says *I* can't use the extra actions to attack; it doesn't say I cannot ask someone else to attack.
Conversation? "Hey, attack that guy."
By using an 'Attack power'? Even though the target is not an enemy, I would say that violates both the letter and spirit of the power. But I guess if your DM allows that sort of shenanigans, that's her/his business. I certainly wouldn't allow an attack power to be used.