I would love the ability to type in map time, gold, level, and hit a button to set those values across the board. I'd like another button that would reset items, towers, minions, and jungle mobs.
It would be perfect for custom 1v1's and practicing jungle. You could just reset the match at the push of a button. You wouldn't have to quit and start a whole new match, load, and wait 2 minutes for things to start. You just hit that button and you and your 1v1 partner can start from spawn with no items, level 1, 475g, fresh towers, and 2 minute strength minions.
This would save people a lot of time and make practicing more efficient and enjoyable.