Hey there wenyingyw! This is a great question, many other users have wondered the same in the past. At this time, it's not quite possible yet to enable both hand and controller tracking. We'd love to hear feedback from our community regarding this, if anyone has any additional insight please let us know! You should also check out our Unity VR Development forum to get in touch with other developers.
This should really be looked into. Using the controllers as accurate location beacons could do wonders for varios applications that need representing 1 or 2 objects in the 3d space.
