We're using Jira Server, and a user raised a question to me today.
Can we highlight a Jira workflow transition button?
My first thought jumped to "opsbar-sequence" so I reordered the buttons to put them in order of "preference" (i.e., moving the workflow forward instead of backward).
However, while I was editing the transition properties, I had the thought that there may be a property for "button background color" or something similar. Something that could set it apart from the other options, as opposed to just a better ordering of options.
A new thought just came to me based on this question:
Approve could be colored green, and Reject could be colored red. That could be a widely beneficial "use case" based on this idea.