The support says:
"The Leap Motion Controller can be used instead of the Oculus and Vive controllers however the only compatible applications are on our gallery below. Unfortunately, the Leap Motion Controller is not compatible with all applications supported on the Vive and Oculus."
These controllers "simulate" the human hands.
Rift with thump, index finger and collectively middle, ring and little finger.
The Vive controller only with open/closed hand.
It seems logical, that Leap Motion could do the same.
Touch/Vive simulates only more or less well hands, Leap Motion tracks the whole hands...
A driver/app that simulate a Oculus Touch Controller, with Leap Motion hand tracking in background.