Martin - nice job!
I got the Trackpad Settings app to work. Here's how:
First make sure you have the latest updates:
From the Start screen, type Update, tap Settings, then tap Check for updates.
Then....
- Open the Search charm, tap Settings, then type Devices and Printers.
- Tap Devices and Printers in the search results.
- Tap Refresh (circular arrow) up on the title bar - until the Surface icon looks like Surface.
Now open the Trackpad Settings app and see if it works.
Hope this helps,
Kate