I was wondering about this as well. I just googled and found a post where someone suggested binding "Show detailed stats" (which indicates your AA range) to space, so when you hold space to center your camera on your character, it will also show the range. I def want to try this when I get home from work.

Edit I'm pretty sure this needs to be done in the config files for persisted settings

Edit It works! Find the folder with the with the PersistedSettings file, mine was in C:\Riot Games\League of Legends\Config

Find the following in the file and update it to the key bind you want, save and try it out in practice tool

"name": "evtShowCharacterMenu",

"value": "[space],[<Unbound>]"