League of Legends – How to Open Options Menu Without Mouse in Windowed Mode

I never played LoL, but, according to a quick google search, there are two ways:

1. Run the game in windowed mode, set the resolution so that it matches exactly your desktop resolution, then hide the window borders using ShiftWindow.
2. Put BorderlessWindow=1 in your Config\gam‌​e.cfg and you should have no need for ShiftWindow. (source)

Again, I never played League of Legends, I just googled this information and have no idea if any of this will work.

The immediate exploit I can think of is destroying Teemo's mushrooms. Since they last for 10 minutes, a spectator could direct a player with an oracle's where to go to clear them.

A spectator could also help keep track of buff respawns, though this is typically handled by the jungler.

Though not directly useful, a spectator can watch a player's play-style and make best guesses about future moves. Any pattern they see could potentially be used against that player.