Fusion 9 Camera Tracking UI confusing

I must say I'm very excited by the new tracking features and they were the first things I tried out yesterday morning.
Knowing a few other camera trackers, I just dived into the camera tracker without reading the manual.
I nearly went crazy with the Solve window and Track Filtering. The Maximum Track Error and Maximum Solve Error sliders are totally counter intuitive. I would imagine that if I select tracks with a Maximum Track Error of 0.15 and a Maximum Solve Error of 1.0, I would be selecting the best tracks...BUT NO.
The Maximum Track Error of 0.15 actually selects all tracks with an error higher than 0.15; and likewise, the Maximum Solve Error of 1.0 actually selects all track with higher solve errors.
I'm sure I'm not the only one finding that counter intuitive. It can easily be changed by making the slider names:
"Maximum Track Error Exceeds" and "Maximum Solve Error Exceeds"
Another mild irritation I experienced was in the Camera tab, where the Focal Length is in millimetres, but the sensor size in inches. Even on the Blackmagic cameras product pages are the sensor sizes given in millimetres.
Just a suggestion from an otherwise very happy Fusion Studio 9 user.

Yes that caught me out as well.

I also noticed that my point clouds in the 3D render did not match the trackers out towards the edges. I assume its something to do with lens distortion given that they were worse away from the center. I just put a lens distortion node on the 3D render output and tweaked it till the point cloud lined up with the trackers.

I wonder if a lens distort node is supposed to be generated as there is an entry for it in the Previous export but blowed if I am getting one.