• Maybe I want to deploy to a different server than my plan dictates. I can't do this because prior builds will have the plan level variables set and you can't change the variables on the fly to take effect
• Maybe I want to change my maven version on my release tag on my manual stage (my real selfish request here)
• Maybe I want to call the release tag something else and I normally have this set in the plan variables (also selfish)

We are stuck right now on the plan level if a build has run and we want to go back and run a manual stage that we are stuck with the variables of that past run. A parameterised manual stage FTW!

bmccoy also thought this was a good idea