Unused/floating pins on BTS5016
I contacted Infineon tech support and got the answer some time ago.

In this application note section 10.2 it is stated that the digital pins has current sources pulling the pins low. So the pins can be left unconnected without problem!

https://www.infineon.com/dgdl/Infineon-Application+Note-PROFET+12V-What+the+designer+should+know-AN-v01_00-EN.pdf?fileId=5546d46259b0420a0159d5c957260d9c