Apple Watch Ultra 2 Action Button Should be Customizable Per Workout

It would help if you could customize the Action button on the Apple Watch Ultra 2 to do a specific task per workout type. Currently I cannot figure out how it's working because sometimes when I start an Outdoor Run workout it acts like a pause button, other times it acts like a Segment button (for the same exact workout type). It would be helpful if us users had control over it per workout type.