This is not permitted under our SDK terms: https://central.leapmotion.com/agreements/SdkAgreement
You may use the SDK solely in connection with a Leap Motion Device and/or Leap Motion Software.
We do have cross-functionality for SteamVR controllers in the Unity assets but only as a means of enabling support cross-platform experiences where Leap Motion is still the primary input. If someone wants to use the Leap Motion SDK for things exclusively other than Leap Motion input, they can get in touch with us for a software license.