The ability to jump like in other golfing games would be great. It will definetly make Minigolf much more interesting and would add that 'what if' element in those maps.
This could be available for purchase in the Upgrades Store. Only if the host has bought it and has turned it on in his map that he is hosting, jumping power wolud be given to the players in the game. The keyboard should be 'Spacebar', ofcourse!