These are transition centrelines connecting two taxiways and are not part of either. They are provided to give pilots a visual guide to a nice, smooth, rounded corner on their turns.

Sure! There was a single building whose boundary was fragmented into multiple ways. I merged the ways at the join points to clean it up.

I had a report today of recent usage of runway 10 for a wide bodied jet. Upon closer examination, the X on runway 10 is in the displaced threshold whereas the X on runway 28 is on the runway. Based on this and the NavCan data, it appears to me that runway 28 is inoperative, but runway 10 is still available for rare use. In any case, the latest taxiway diagram shows it as a runway.