I thought about all the people who asks for a driving range / putting green.
It would be simple to create a PRO SHOP item called "Mulligan" that comes in 10/50/100 shots at different price levels.
You would be allowed to use it only in solo and practice games, so you can mulligan a shot that you want to try again and again.
The ball will warn out for every shot, but at least you would be able to try again, hence you will have the opportunity to make a driving range / pitching range / sand training / putting green with every shot.
-abq-