Instant coin regen
Start the game like normal, then force close it. Go to your settings > date & time, advance your date by 1 day, then exit back to home screen. Start Coin Dozer like normal again, and you will have your full complement of coins from regen. Repeat as needed. Keep in mind that setting your date back to normal after closing the game as second time will not reset your coins or anything like that, but you do have to enter the game and exit out before setting your date back to normal, you can't set the date forward, then set it back and then enter the game.