Let's get the usual objection out of the way first: if a league admin abuses any ability they'll find themselves routinely trying to attract new owners as their league is under threshold due to people leaving.
The pitch: with every evolution of the game there will be some plays that over-perform, potentially to the point of spoiling the overall game experience. This is inevitable. There's a saying in game development, "you can't patch the players" which means that no matter what your intentions are players will find exploits and use them.
To that end it would be incredibly useful for league admins to be able to block the use of certain easily exploitable plays. There will always be a disparity between those who dominate thanks to a few overpowered exploits and those for whom it doesn't work (or they lack personnel etc). The same is true when defending against overpowered plays.