I think the look and feel would be better if the Change button where positioned below the Reply button. Having the Change button positioned to the left of the Reply button reduces the number of usable columns in the comment box.
This can be seen in the attached example, TicketChangeExample1.png. I'm using the EmailProcessorMacro and you can see that in the first comment the formatting nice because there was a ticket change comment added to the first line. In the second comment a scroll box is added to the Email block because the Change button is taking up some of the usable column space.
This is somewhat related to ticket #4454 in terms of enhancing the appearance of the Change button.