Googleing highest vertical jump reveals a guy in Canada had a 63.5" jump. In the NBA Wilt Chamberlain and Darryl Griffith had 48" jumps. A number of others were recorded at 46", including Spud Webb, but MJ not on top ten list.
Grabbing a quarter from the top of the backboard would be possible but only by a precious few.
I don't know that there are records on hang time. Gravity rules; jump higher and stay in the air longer. I suppose that if you flex the knees while in the air the time until the feet hit the ground would be slightly delayed.