Bugs in the physics of UE4

Where is this exposed? I have UE4.7.5 and can’t find the BounceThresholdVelocity value anywhere. Looking at the source change it looks like PhysicsSettings has the BounceThresholdVelocity placed just before the Friction Combine Mode, but when I go to my Physics settings I have “Locked Axis” before that option. I did find p.BounceThresholdVelocity in the Device Profile. I changed this for “Windows” but it didn’t seem to effect my physics scene. As I understand it, that only comes into play in a packaged game?