Set to default controls
There is no in game "return to default " button to reset your changed controls !!This is very important because some people have changed some controls and cant swich back to default !!!!
I was able to reset the settings by doing this:
-Open steam -> Settings -> Downloads + Cloud -> uncheck "Enable Steam Cloud Sync... "
-Go to "C:\Program Files (x86)\Steam\userdata\41895318\570\remote\cfg" and move/delete "dotakeys_personal.lst"
-Open Dota 2, and if you want to use steam cloud again just check the option on steam settings again.
I always wondered where the heck those keys were stored. Now I know. I wonder if it's at all possible to add my own rows/entries to the settings panel and have them show in-game. Probably not, but time to get crackin' on improving my keybinds some more.