Diary: Display speed over distance instead of pace over distance

Problem: Is it possible to display the average speed in km/h or mph instead of pace?
Solution: An activity is always assigned to a diary. And a diary can be of a sport type like running, biking, etc.
If you change your default diary to the sport type biking, it would affect the display for all entries within this diary.

TrailRunner > Preferences > Personal > Diaries: Select the diary and then change the type in the table Popup.