The only hotkey/keyboard shortcut for the shop (that is built into the game) is "P" which opens the shop menu.
As far as "plug-ins" are concerned, you might want to check out the EULA
You agree that you will not, under any circumstances:
E. Use any unauthorized third-party programs that interact with the Software in any way, including but not limited to, “mods,” “hacks,” “cheats,” “scripts,” “bots,” “trainers,” or automation programs, or any third-party programs that intercept, emulate or redirect any communication between the Software and Riot Games, or that collect information about the Game by reading areas of memory used by the Software to store information about the Game.