Thanks for playing!
In actual combat I think holding down the mouse-button to change your setup could benefit from this either slowing down or "freezing" the game.
Maybe something like a second of time slowdown when you enable mixing? I suppose that could help but I'm afraid it would lead to players spamming RMB to exploit the slowdown. I'll experiment with this.
This is an early comment but I I probably still have not figured it out. See that as either a detriment towards the tutorial or me as a player.
It's probably the game's fault! This is the first time I've tried making a tutorial so it's probably not great. I can answer any mechanic related questions you may or may not have.